# Film Negative Processing

Signal chat: [https://signal.group/#CjQKIHHhnsQAZbMd9t4TxumxNguOwY8Pckc5wvTLpSRjiPekEhBBZxKZvAOHUEsqgp912fH6](https://signal.group/#CjQKIHHhnsQAZbMd9t4TxumxNguOwY8Pckc5wvTLpSRjiPekEhBBZxKZvAOHUEsqgp912fH6)

# Negative Processing Chemistry Research & Recipes

Some links to lower-toxicity recipes for dev/stop/fix, with some price and source exploration:

### Chems

Sodium thiosulfate (pentahydrate/crystalline) - \[FIX\]

400g - $37 - [etsy](https://www.etsy.com/listing/564506727/sodium-thiosulfate-pentahydrate?gpla=1&gao=1&utm_source=bing&utm_medium=cpc&utm_campaign=shopping_us_en_us_search_partners&utm_custom1=_k_9d47b1a3dec01b190dbbdb3058d9b3c3_k_&utm_content=bing_319339186_1310617986645934_81913644654434_pla-4585513245482005%3Apla-4585513245482005_c__564506727&utm_custom2=319339186&variation0=6711627100) - $0.0925/g  
113g - $7 - [ebay](https://www.ebay.com/itm/391427730454?chn=ps&norover=1&itemid=391427730454&targetid=4580702899365303&device=c&mktype&googleloc=97157&poi&campaignid=418640321&mkgroupid=1233652283797640&rlsatarget=pla-4580702899365303&abcId=9300602&merchantid=51291) - 113g – $0.0619/g  
2500g - $50 - [ebay](https://www.ebay.com/itm/282067085943?_skw=Sodium+Thiosulfate+Pentahydrate&itmmeta=01M184MZKPRK7H5QGFPJRKZ45B&hash=item41ac822a77:g:sSUAAOSwRQlbEb~l&itmprp=enc%3AAQALAAAA4GfYFPkwiKCW4ZNSs2u11xC%2B4x1RZyWfWiwRW6CKOtfaaL%2FGplrjHXFfEqrLzCshiYrlAyET7sPrO%2FE9ACkVzX5D3YZxJMcjs75B250PLBCXL%2FUQ4WCaGl1UJkw2odQ38%2BOai8ugyhWMXn6vZztuIRv2kjW3%2FkFIrhA44R3K%2BLs96tzr8F2i6TA%2Fbym7%2FZLOBQD7EZF531IJ8xOIFWos4SKlh1dlg4JV0%2BUpzE%2BEUOGi6vPf70yZoh5bOuJymThxETgv2E2HlcfaZLKXc1Wgo4UbQzRtMl7Bo4coohlWSdD%2B%7Ctkp%3ABk9SR5z604SKaA) - $0.0200/g  
1360g - $55 - [ebay](https://www.ebay.com/itm/392752528257?_skw=Sodium+Thiosulfate+Pentahydrate&itmmeta=01M184MZKPV0ZEA0Q4D1J1MJBR&hash=item5b71dffb81:g:jzkAAOSwielei9~M&itmprp=enc%3AAQALAAABAGfYFPkwiKCW4ZNSs2u11xBGYoeWio7S%2B7dJyz7WKPC16iDCaq7zrII2XnfxQWY7NTavb%2F2dGFHPkb7NsodaeF6gM55uFUQkFpz4g3H0pb8zJeA61B6hmCq9VhJZ7o4FkWXbB%2BqBEbSL2IAlPZm6SJe9hgqqygrKvWxFiAIwdkbzhltqSz10KiZBU%2FpsamjryvMsCcgu3fs8iRswpyQUjquydX38TUjpru2Z7jy7f97YNbmPZeOasCOy3I6jsY5mySq3tnb6WNHLGXOsEiBV9abGHKr47Ek5nt8%2FUC7NuzY4kAlWdXgk%2F3nY1uhmytIYzGki%2FOdnygVCEudPBbCtm8Y%3D%7Ctkp%3ABk9SR5z604SKaA) - $0.0404/g  
1360g - $50 - [ebay](https://www.ebay.com/itm/392752528284?_skw=Sodium+Thiosulfate+Pentahydrate&itmmeta=01M184MZKQ4TTSY8XBJ0HBHWRA&hash=item5b71dffb9c:g:iPEAAOSwOfFei9~O&itmprp=enc%3AAQALAAABAGfYFPkwiKCW4ZNSs2u11xAF5cXLyl5A5BV8VF0QOroauxGo0fN95YKlMOiVOYMk6ayzuVWohzp9g4sqvKUiQmHMbunX6h2li5gYQCEC8RNLprkZPXvu9cPe52RChiFslVl4lps7F7g15M5Anh8yCQET3DvE4YJY8tz5eLqtXNR5KvYlhmo2sGS%2B3yFfAM1UAAnEccztnTkH%2FND0OgG8e8JPvKzX4gYzsCGMXhsyfq5y2gvwHMxh7owBrsCrOxQZjVIpqyABwZeGdI8Hgvy58%2FetgxKxmsIA2JVTq7IU3toNzDmSQutlgsDYk8GpYti1D5VK3bI%2B%2B9%2FaDMlZJFUNvwg%3D%7Ctkp%3ABk9SR57604SKaA) - $0.0368/g  
450g - $15 - [ebay](https://www.ebay.com/itm/406214961337?_skw=Sodium+Thiosulfate+Pentahydrate&itmmeta=01M184MZKRMBTF9ZRPWDH2E7X8&hash=item5e944c68b9:g:lKwAAOSwqRJnj4gX&itmprp=enc%3AAQALAAAA4GfYFPkwiKCW4ZNSs2u11xBtzH7djYfVLVIGffWINqdXfK%2B38of%2Bp7s%2Bwz8GH3Aq6EhpHB5fRx52ZiRVVemvA4DXwVMwBbTclD6G39d0JoprNutC1gFnHZr39NkJHX6RRIVx3hXuqNWrCPPxyBVaKZjUqR4ioPPqbyn9pCj77x6TdZfTlX62dnxNlumxKwM0vm7zWa6tnwsIObiyan%2FTt2oN3q881h6NuL8JyXE2qD764QHidw3qAUnLzjyEH3IlQ%2BkwAzkoVFySUmPwTAVhs1I1OXR3PXLDypXwRZoyKasW%7Ctkp%3ABk9SR6D604SKaA) - $0.0333/g

Sodium sulfite (anhydrous) - \[FIX\]

30g - $40 - [ebay](https://www.ebay.com/itm/285039362622?_skw=Sodium+sulfite+anhydrous&itmmeta=01M1854CZMEGTA97PSY2W5D179&hash=item425dab823e%3Ag%3A4dUAAOSw0lRj9CNv&itmprp=enc%3AAQALAAAA4GfYFPkwiKCW4ZNSs2u11xDyaFyh0vUinBNFHLUAc%2BVNETamQ9iXmwOnA4y6EblEvWdoy%2B9vQX4UMOtW1nyEiLM3oweE9nQ2qaONMo5ZyCfUiU%2F70DdkMrlK9GaGN3cdzDaUI6QPQ%2Fsj%2FyrESf8aybGFrXHSMo5waUvfoKcFsG9%2Bmgxr6%2BiZhsbeq34H2OPrgJuXqZjgW0jhdgg0V4EOyKWVmOhTz0CEReGTNmZyrf0n6JFfw%2Bwpi%2FeUERmA%2BeHaT4f80uTxYUj22Jxg3rQERzJJF%2BkL3TBqm0R7f8oIBbdM%7Ctkp%3ABk9SR4LQkYWKaA&var=586873129966) - $1.33/g  
500g - $150 - [ebay](https://www.ebay.com/itm/285039362622?_skw=Sodium+sulfite+anhydrous&itmmeta=01M1854CZMEGTA97PSY2W5D179&hash=item425dab823e%3Ag%3A4dUAAOSw0lRj9CNv&itmprp=enc%3AAQALAAAA4GfYFPkwiKCW4ZNSs2u11xDyaFyh0vUinBNFHLUAc%2BVNETamQ9iXmwOnA4y6EblEvWdoy%2B9vQX4UMOtW1nyEiLM3oweE9nQ2qaONMo5ZyCfUiU%2F70DdkMrlK9GaGN3cdzDaUI6QPQ%2Fsj%2FyrESf8aybGFrXHSMo5waUvfoKcFsG9%2Bmgxr6%2BiZhsbeq34H2OPrgJuXqZjgW0jhdgg0V4EOyKWVmOhTz0CEReGTNmZyrf0n6JFfw%2Bwpi%2FeUERmA%2BeHaT4f80uTxYUj22Jxg3rQERzJJF%2BkL3TBqm0R7f8oIBbdM%7Ctkp%3ABk9SR4LQkYWKaA&var=586873129966) - $0.30/g  
500g - $50 - [ebay](https://www.ebay.com/itm/402797718652?_skw=Sodium+sulfite+anhydrous&itmmeta=01M1854CZMN4SJGGTSC5VCVYT0&hash=item5dc89d6c7c:g:R6gAAOSwLYRgezS-&itmprp=enc%3AAQALAAAA0GfYFPkwiKCW4ZNSs2u11xC1aZ42XeTi%2BUXJY6eESH3VC4cerX1GwcPg3XIlY1YCy9CYCcdX5fzEC4mBbSxzKQa9TDRK6ixYd8DD%2BzE%2FTz%2BwXr1p7u9Ox81CvSsL35W6syClPAEsAqW8GW9rHEKCgKDt3djg%2BDXphAJvKhwKfm5y--mIpcEyZubyIETBMmyqoSKnIrWjS%2BiMAw9xnaf7PRDTxknPwi94%2FTmCXq1QkeKJh%2FKtyMIvQa%2F8XhVE0iQbZoWOqVsLnLKaLF86hHWDYFA%3D%7Ctkp%3ABk9SR4LQkYWKaA) - $0.10/g  
450g - $30 - [ebay](https://www.ebay.com/itm/336707442055?_skw=Sodium+sulfite+anhydrous&itmmeta=01M1854CZMYGG1AZ7NQY49TSJJ&hash=item4e6553d587:g:gvQAAeSwlOZqZH7g&itmprp=enc%3AAQALAAAA4GfYFPkwiKCW4ZNSs2u11xD9eXgnLZP%2BSUYpHHrf51sYH2d9yvc7CL2lHsPcj5pkno6fUnSP6rqUdyfEGvxy86idAblvo1B0mfgZ1rvdVAmNWSEj7KldujC%2BDg973nC4C8CGSyja1ZzCp1RncwaJzaKNgqJzXPpERG8yZgogQGD4p1ZkMjBeazn0HAeSU4Zg9DCWYygNxIuc7IObJ0Mf10f1EWzmk22kwJQA%2F29qzGwCi7M5vxelO4sLp9nI1PjzheItP1WlX6%2FabPQBUd%2F5OZ8NxjsWch8mOQcZQ7UvkTqf%7Ctkp%3ABk9SR4LQkYWKaA) - $0.07/g  
450g - $23 - [ebay](https://www.ebay.com/itm/405920066480?_skw=Sodium+sulfite+anhydrous&itmmeta=01M1854CZN9A95DZCRRE2NAT3A&hash=item5e82b8abb0:g:34YAAOSwqx9oPgf7&itmprp=enc%3AAQALAAAA0GfYFPkwiKCW4ZNSs2u11xDOo3gptE6OeZMFp0B7Rpqnj0TBUosqenqSbd3YbJz%2FgLmGLRgFFSASDmMC%2B6BspzaDmH0%2FI5VjdyQWbL%2B4aIiz1%2FYJWd7WKpUjkxsgYPhXWhvUloD6dNMuvoUeup0B5yc3Ozf7pSmmOI15QunHrZ3artPmYgl9fmfTzu62d1F9PKaSq37CppWRL5JlnKbaD%2FrOeYMSZ8%2FT1v%2BPVnAY2%2BLCQ%2BO4JYuYLsyCJ3G8MMvaQKsRN45HUUDvJfHccnkuUDU%3D%7Ctkp%3ABk9SR4LQkYWKaA) - $0.05/g  
225g - $16 - [ebay](https://www.ebay.com/itm/406329853191?_skw=Sodium+sulfite+anhydrous&itmmeta=01M1854CZNEHNQPF81WM0KT939&hash=item5e9b258507:g:34YAAOSwqx9oPgf7&itmprp=enc%3AAQALAAAA0GfYFPkwiKCW4ZNSs2u11xC%2BeGv9OXKWo9r0NXNpmUqWHwO5gku1%2B8vvH2wCi%2FgSpypV0V16vX%2BNQQe1CIqfxY%2FRQC7HOv5ablYLp0MPTqvQPKBTVsLZkk%2B9zqAYZeD7XtOl0%2FGkIp5dvw6BMYbJchecsnklbmlsvzlqb4W0GYm%2BFLmGhpBYhki6SnpElhcU8XFLoNck5D%2FG3pt0xg8egArI%2F8Oj1M2j%2B3nn%2FmuombzGHNE5J0amY2vKk%2FVXwoAVLv8kEy37Gpqcaig9WLpFTF0%3D%7Ctkp%3ABk9SR4LQkYWKaA) - $0.07/g  
450g - $14 - [ebay](https://www.ebay.com/itm/146620218968?_skw=Sodium+sulfite+anhydrous&itmmeta=01M1854CZNFDARGZ4Y91R4E0Y3&hash=item22233efe58:g:8dsAAeSw6ENoPKbR&itmprp=enc%3AAQALAAABAGfYFPkwiKCW4ZNSs2u11xDmfirdcXqHvFKy32bSQyEBh4BF7FSFIVijglu5yzn%2F%2BQfs5nzYJZsvlo%2Fu6WTdXKo5OwYHKYmW23WcMf0tGOITcdwLaYmHiJgJ7USHrZ1KNaJn%2Fsgli4gSFWSmYcaOvvOS56f3GevjDbGlSlo9Rros8HQ2NEO7vMF8SNQ%2FC9AwUDRkx3TPWoNjpJfP3pRVUWYUyOk%2F8v1rCTxGGs0pgZ6zES60whX9l4WsWDtMbrAXEgmItIIJeOPEtklQnFbozXfmdoYA1mZngvSZo%2Br7mKg1ZyUvhUc6ggQggh20uUDaHOantdKzEv41qya48ZMFFRI%3D%7Ctkp%3ABk9SR4TQkYWKaA) - $0.03/g  
100g - $10 - [ebay](https://www.ebay.com/itm/406329853921?_skw=Sodium+sulfite+anhydrous&itmmeta=01M1854CZN0R2DT8PK70F3FXAF&hash=item5e9b2587e1:g:34YAAOSwqx9oPgf7&itmprp=enc%3AAQALAAAA0GfYFPkwiKCW4ZNSs2u11xBn1NjkI12EOLNV2S89kmkdCyvWtekdh5ofTJg%2BzIh0gR0kFDC0qZqF9PMVAeIswaF1VOEvF9JXD1bvojNpoaFAvyIRJQx4XRniZyIluT13KtsVKCeKOxvyIuQIdq8vOUvNIQM14RoSZgMFFrMUZmNdfkxz%2Fk66oBMFkDK7P1n80%2BqU9UU8kpbasC%2BQFMNaI0QPO3TgIAj4tqpCGVQI04VuY%2FjNohYQMZ9k92A0hOhEXy9l7RY8UAoPwnFe0GaOCI8%3D%7Ctkp%3ABk9SR4TQkYWKaA) - $0.10/g

Ascorbic Acid \[DEV\]

225g - $13 - [ebay](https://www.ebay.com/itm/301989940738?_skw=ascorbic+acid+powder&itmmeta=01M1AEM2H6Y2BB4N9T0C4S358W&hash=item465000ce02%3Ag%3ATDoAAOSwOVpXZjpA&itmprp=enc%3AAQALAAAA8GfYFPkwiKCW4ZNSs2u11xDzZ2MKfs%2FiMsK67jlao%2Fua3gYmaKO2B0tgYZWwVybe%2BCd8b1qRLwWSdk%2BbBuoUo2gPatJ%2F2CPtCVGIZ8i9Fu8uJ7dcNefpyM2mHxjdxx91%2BiTtZWvl%2BE2myEW8%2Bm9J5wKLygn%2FF3gwI%2BAjwKfpl5WZjzQk8QmAYPQfJzgkiJV1DUhH1nQ1%2BPIGjdOXYrzXb7xfCQ%2Bajv0ztnQyzxBkQv8WNfxoaRYWza9pdtXh9AapHrW3NHmgVFsbLiJ%2F6LWvzLYsip%2BO5SMLDWzcajfNe%2Fe7uQ%2FzCkDMOVUHgtngS0pBAA%3D%3D%7Ctkp%3ABk9SR-qo0M6KaA&var=603363614328) - $0.057/g  
1000g - $40 - [ebay](https://www.ebay.com/itm/232320074884?_skw=ascorbic+acid+powder&itmmeta=01M1AER9Q6D7DEG1D9QEQR49P8&hash=item36175b0484:g:ThoAAOSwYYtgc6CU&itmprp=enc%3AAQALAAAA0GfYFPkwiKCW4ZNSs2u11xCo2EQYbDO2usp5ouGVc9m38oPIn88bFKySqQua9i9ubUEb5jKwHTSwRqwgpI%2BsdrLeJqrmOnMsd8pF3Fis6QIj1EUbmCgM9pqyDek7xC3M%2FdwLqJNcckD%2FtqtF0qeJyau6PYl%2FJhX1dx3ZUBdocGDv8QIlNRq9SIkEXmQQgWvGiWJ9f7jAYflOOmCHLSPzuVHhnNob8QKeM74BLluN8Qa%2B3PiYFU6rVBPD1p5cnlzQgMT54vrHBheENRsRbHg1SKk%3D%7Ctkp%3ABk9SR-6b4c6KaA) - $0.040/g  
500g - $23 - [ebay](https://www.ebay.com/itm/231438943087?_skw=ascorbic+acid+powder&itmmeta=01M1AER9Q9YMZWFCSRYQPTH21Z&hash=item35e2d6036f:g:-4MAAOSwzMxht7Fq&itmprp=enc%3AAQALAAAA0GfYFPkwiKCW4ZNSs2u11xA0aEaOo6NZdSt8xIx%2FxwsoGjzsJ16eLFPu8F620ludbkxCccETRKetSXPtLhe5DfYGYroIYApjioURtnxSWEAtTqHYdeVXc68KazxQ0Pp6d%2B0UdjYEhuLPVqFPGARbO%2FoKQ7tzXkHQ5OSMz3F3q48C1CSTCi%2BVbhTtzlHjc3eBU%2BK7xaN4PIW4QKuLk9oDWIoOyf9yldJQG8Gfux7z7L5yZz3SaxDGJcWkM%2BfTQ2S3GFR%2FmocI4sSncJbegwutt5M%3D%7Ctkp%3ABk9SR_ab4c6KaA) - $0.046/g  
450g - $35 - [ebay](https://www.ebay.com/itm/252188495083?_skw=ascorbic+acid+powder&itmmeta=01M1AER9QAYSQ7NDN476SHZMDR&hash=item3ab79b0ceb:g:2IkAAOSwmdtg3inB&itmprp=enc%3AAQALAAAA8GfYFPkwiKCW4ZNSs2u11xBanp8jiQCiWKITRxAVhFSICw4GQcsa1NPzlCVhURmdUHXIvtqHpCElD%2B%2FKnz%2F8Dnoa6eJXrBooYFcnmUJXrCaI3mfKrpvYPm0mwwJ6q630jxGwNP2wUbVMI9GvQBT5B8haWea9eCdkf89rsiw5TaxCKS8U2AFBwS%2FlOWCbvzp5rbHHHcjyFIFF7VZXWNqVEP2zO8kRpGmiX6ELWokK84moIcZm6C6zF12TPyO0zrnxgA7Z9meGjQ3H5rhQpB3%2BimA0QV9ffsZRhAfFIAyKuy9nBCxvkm6rmSCwDUzq1pcLCA%3D%3D%7Ctkp%3ABk9SR_ib4c6KaA) - $0.077/g  
225g - $17 - [ebay](https://www.ebay.com/itm/297907699547?_skw=ascorbic+acid+powder&itmmeta=01M1AEV0HZNT010KQQXZTC0PHD&hash=item455caebf5b%3Ag%3AwecAAeSwKuppWvqY&itmprp=enc%3AAQALAAAA0GfYFPkwiKCW4ZNSs2u11xC4XoM8xX1fFlbbVaHYCEbCb9hjUVlueb%2BdAgv5%2FXMdyPcJ%2FgwGqzyHcTbx4QnxJZBgWtitEc5YbvFiPCujRjib8UHONPhdzSHD%2FkzeYi3YO3jsj3ZJ9mDHju7%2BofGIyp7Q3g953CMy3hunFu6wFjm1obT5KrcFTiOFUG79xwH8i4opGb2iVKelsVwogoKYOAq%2BQaXGO9mKDqpvYwUfP9aizBy7Q56ASk8TuD0y5fR5CwwJKueQjVxDY%2F1zMrRPLcc%3D%7Ctkp%3ABk9SR5yJ7M6KaA&var=595132544191) - $0.075/g  
450g - $20 - [ebay](https://www.ebay.com/itm/297907699547?_skw=ascorbic+acid+powder&itmmeta=01M1AEV0HZNT010KQQXZTC0PHD&hash=item455caebf5b%3Ag%3AwecAAeSwKuppWvqY&itmprp=enc%3AAQALAAAA0GfYFPkwiKCW4ZNSs2u11xC4XoM8xX1fFlbbVaHYCEbCb9hjUVlueb%2BdAgv5%2FXMdyPcJ%2FgwGqzyHcTbx4QnxJZBgWtitEc5YbvFiPCujRjib8UHONPhdzSHD%2FkzeYi3YO3jsj3ZJ9mDHju7%2BofGIyp7Q3g953CMy3hunFu6wFjm1obT5KrcFTiOFUG79xwH8i4opGb2iVKelsVwogoKYOAq%2BQaXGO9mKDqpvYwUfP9aizBy7Q56ASk8TuD0y5fR5CwwJKueQjVxDY%2F1zMrRPLcc%3D%7Ctkp%3ABk9SR5yJ7M6KaA&var=595132544192) - $0.044/g  
900g - $30 - [ebay](https://www.ebay.com/itm/297907699547?_skw=ascorbic+acid+powder&itmmeta=01M1AEV0HZNT010KQQXZTC0PHD&hash=item455caebf5b%3Ag%3AwecAAeSwKuppWvqY&itmprp=enc%3AAQALAAAA0GfYFPkwiKCW4ZNSs2u11xC4XoM8xX1fFlbbVaHYCEbCb9hjUVlueb%2BdAgv5%2FXMdyPcJ%2FgwGqzyHcTbx4QnxJZBgWtitEc5YbvFiPCujRjib8UHONPhdzSHD%2FkzeYi3YO3jsj3ZJ9mDHju7%2BofGIyp7Q3g953CMy3hunFu6wFjm1obT5KrcFTiOFUG79xwH8i4opGb2iVKelsVwogoKYOAq%2BQaXGO9mKDqpvYwUfP9aizBy7Q56ASk8TuD0y5fR5CwwJKueQjVxDY%2F1zMrRPLcc%3D%7Ctkp%3ABk9SR5yJ7M6KaA&var=595132544193) - $0.033/g

Sodium Carbonate \[DEV\]

500g - $40 - [ebay](https://www.ebay.com/itm/198591864177?_skw=sodium+carbonate&itmmeta=01M1AGE0PC8744RZX88ZV14QXC&hash=item2e3cff5d71:g:dloAAeSwtwVqjFPw&itmprp=enc%3AAQALAAAA8GfYFPkwiKCW4ZNSs2u11xAYeGacqTXCrFMEWTXpmDZBwgHnM2PqwYZsfrM7I9lGyBnsoF4u8mV9hanJKWNCl6A4gAxX05odtw5DxCLoRw%2FkuNEZ%2B%2BS9%2BwTK28yGI45zpaXaHbOQ29B36pjtcnZ6tE5QnITlNVrELGSt%2BEWi5G84LON5eoSAYyLl%2FPZ9CNfOJp8wGijKYFr%2FKrGZhTJHyYWXM4bCGS5cif%2BxYgkwiopmQwZ1puz6JGLk827IJUjk3Dzc6YitZwGPiLssO4N2FOE%2FiorwIhXBZNTF%2Ftq%2BpYwumBjmMt23diiIuKFwE8iu0Q%3D%3D%7Ctkp%3ABk9SR6yLuNCKaA) - $0.080/g  
680g - $37 - [ebay](https://www.ebay.com/itm/221939879039?_skw=sodium+carbonate&itmmeta=01M1AGE0PCC84C7CGWADH2Q5VD&hash=item33aca5cc7f:g:ancAAOSwIwhWRVQH&itmprp=enc%3AAQALAAAA0GfYFPkwiKCW4ZNSs2u11xCu3iImku0CtuVjX0a9cOpV%2FW3Mt7KxCheqjUw1Q8%2FJF7I9ZtWTY9M%2Fivm0wczTOM1sVGQf4ISjagK5l%2B7XZNxHbXqtmV60VLNH6e8Jmc79m3o4umStB70piEsbHkH%2FEyvpez13vrHrfie3HUB2VmeLYBns0uYh4nf%2BZeRp%2FhKtttg81T3xMKhrTSPYb0waxjgKcWuLE7AwXmQdszT9hNsWv7Kz5GPvaO29dZvEzpTWLujWOUjTXrKuOQZ2H0xZfZs%3D%7Ctkp%3ABk9SR6yLuNCKaA) - $0.054/g  
1000g - $30 - [ebay](https://www.ebay.com/itm/114215402523?_skw=sodium+carbonate&itmmeta=01M1AGE0PCW99X2DG0FSYV8JY0&hash=item1a97c4bc1b:g:tJcAAOSwTlVes4z2&itmprp=enc%3AAQALAAAA8GfYFPkwiKCW4ZNSs2u11xC5vhrdciI87o7ZDRHM0ErcDRSD%2BBr%2Bgy4wh6vafeblWtHg9O04Xco3a1%2BdgGWfILDlj8xh1FkQLfLVSRkO4rAtOpZczsATkNHOV9XC9wmZykP5ec0zJ8cjpx7tlr3P4iEFZPhIO8edVN%2BUGdy0QA0SzygnFRUebleQ1x26J%2F2tdusxetQs8is5wxAbkZjpXf7iAP1qLnKusx%2BtoeAMgaVrtpGfEeT7GJ7HCfXT%2BunF4R3TevRkDDSEfXoFWyA8byRQcs34EQSwYXuzzQiLBwkaUuDrnGnSVF%2B0pajundhvcA%3D%3D%7Ctkp%3ABk9SR6yLuNCKaA) - $0.030/g  
100g - $5 - [ebay](https://www.ebay.com/itm/203938785070?_skw=sodium+carbonate&itmmeta=01M1AGE0PCG86RHPD6JWPSZJGR&hash=item2f7bb2e72e%3Ag%3AN-wAAOSwjzdic1YK&itmprp=enc%3AAQALAAAA8GfYFPkwiKCW4ZNSs2u11xBtR2SjLOcno5MHDiBB1eBGdhMyuk%2BUMq%2BbDCZKkpJeJ8Y9AhT0BJuY4ZwynfYJaBgi9kZAAwfq622tbhmDDlePHURzaU4eQz5cwYHcKXYE6fq6D1vb6PphuCfNDEHcs9U2PAwoIQJGvE6%2BsEozjBgfmTIL%2BPQX2hMWt3mjACnovUImkM%2F7rHNcVQkvX6WvmxMn400mz4%2Bb%2FfOm%2BKyrXyBIkklVg0NSnVHrNwCJpGpZsfTf%2B%2FWXlQycVaMSBdCA%2BV3pDxpiVVTaBo5ZMAiJkrIGOi27DtsmssLjGJU%2BGs9exA%3D%3D%7Ctkp%3ABk9SR66LuNCKaA&var=504394256868) - $0.050/g  
500g - $12 - [ebay](https://www.ebay.com/itm/203938785070?_skw=sodium+carbonate&itmmeta=01M1AGE0PCG86RHPD6JWPSZJGR&hash=item2f7bb2e72e%3Ag%3AN-wAAOSwjzdic1YK&itmprp=enc%3AAQALAAAA8GfYFPkwiKCW4ZNSs2u11xBtR2SjLOcno5MHDiBB1eBGdhMyuk%2BUMq%2BbDCZKkpJeJ8Y9AhT0BJuY4ZwynfYJaBgi9kZAAwfq622tbhmDDlePHURzaU4eQz5cwYHcKXYE6fq6D1vb6PphuCfNDEHcs9U2PAwoIQJGvE6%2BsEozjBgfmTIL%2BPQX2hMWt3mjACnovUImkM%2F7rHNcVQkvX6WvmxMn400mz4%2Bb%2FfOm%2BKyrXyBIkklVg0NSnVHrNwCJpGpZsfTf%2B%2FWXlQycVaMSBdCA%2BV3pDxpiVVTaBo5ZMAiJkrIGOi27DtsmssLjGJU%2BGs9exA%3D%3D%7Ctkp%3ABk9SR66LuNCKaA&var=504394256869) - $0.024/g

#### Developer

##### Caffinol

[https://petapixel.com/caffenol-developing-film-with-coffee/](https://petapixel.com/caffenol-developing-film-with-coffee/)

[https://www.35mmc.com/18/08/2020/polyphenol-developer-alternatives-a-world-full-of-options-by-daniel-keating/](https://www.35mmc.com/18/08/2020/polyphenol-developer-alternatives-a-world-full-of-options-by-daniel-keating/)

Possibly with espresso given that we have coffee roasting and an espresso machine?

#### Stop

#### Fixer

##### Kodak F-24 based recipe

- Sodium thiosulfate (pentahydrate/crystalline): 240g
- Sodium sulfite (anhydrous): 15g
    - preservative, keeps the bath from oxidizing/degrading between uses
- Water (warm, ~40°C to help dissolution) to make 1L total

### Equipment

- [ ] Changing bag
- [ ] Measuring stuff
    - [x] 1x 250ml graduated cylinder
    - [ ] scale
- [ ] PPE
    - [x] Apron from basement
    - [x] Goggles
    - [x] Nitrile gloves from basement
- [ ] Tanks
    - [x] 3x 2-reel 35mm steel
    - [x] 3x 1-reeel 35mm steel
- [ ] Reels
    - [x] ?x 35mm steel
    - [x] 2x 16mm steel
    - [ ] 120/220
- [ ] Thermometer

# Negative Drying Cabinet

(Can be used for drying other stuff too, esp. if further modified)

## Initial Build

Started by finding a wooden cabinet on the street.  
Removed a bunch of weird stuff attached too it, painted with coat of oil-based white paint.  
Attached a tiny set of casters.  
Tacked a strip of thin hook velcro to cabinet lip.  
Glued wide soft velcro to vinyl sheet.  
Taped to a metal tube to wrap/roll up front door.  
Added wooden cross-supports to help keep vinyl from "collapsing" as much when opening/closing.  
Attached printed hooks to hold ends of metal roll-tube.  
Trimmed down some found tent-poles to interior cabinet width  
Attached printed "comb" to hold cross-bars.

### Currently

It's \*ok\*

\- Not the greatest seal  
\- Not the easiest to open/close

[![negative-cabinet-01.jpg](https://wiki.ridgewoodcommons.nyc/uploads/images/gallery/2026-09/scaled-1680-/negative-cabinet-01.jpg)](https://wiki.ridgewoodcommons.nyc/uploads/images/gallery/2026-09/negative-cabinet-01.jpg)

[![negative-cabinet-02.jpg](https://wiki.ridgewoodcommons.nyc/uploads/images/gallery/2026-09/scaled-1680-/negative-cabinet-02.jpg)](https://wiki.ridgewoodcommons.nyc/uploads/images/gallery/2026-09/negative-cabinet-02.jpg)

[![negative-cabinet-03.jpg](https://wiki.ridgewoodcommons.nyc/uploads/images/gallery/2026-09/scaled-1680-/negative-cabinet-03.jpg)](https://wiki.ridgewoodcommons.nyc/uploads/images/gallery/2026-09/negative-cabinet-03.jpg)

[![negative-cabinet-04.jpeg](https://wiki.ridgewoodcommons.nyc/uploads/images/gallery/2026-09/scaled-1680-/negative-cabinet-04.jpeg)](https://wiki.ridgewoodcommons.nyc/uploads/images/gallery/2026-09/negative-cabinet-04.jpeg)

[![negative-cabinet-05.jpeg](https://wiki.ridgewoodcommons.nyc/uploads/images/gallery/2026-09/scaled-1680-/negative-cabinet-05.jpeg)](https://wiki.ridgewoodcommons.nyc/uploads/images/gallery/2026-09/negative-cabinet-05.jpeg)

[![negative-cabinet-06.jpeg](https://wiki.ridgewoodcommons.nyc/uploads/images/gallery/2026-09/scaled-1680-/negative-cabinet-06.jpeg)](https://wiki.ridgewoodcommons.nyc/uploads/images/gallery/2026-09/negative-cabinet-06.jpeg)