Specials

Developers 

The table of developers for wet plate collodion process

Name of 
Developer

Process

Ferrous 
Sulfate

Copper 
Sulphate

Potassium 
Nitrate

Barium 
Nitrate

Silver 
Nitrate

Formic
acid

Nitric 
Acid

Sulfuric 
Acid

Acetic 
Acid

Ethanol
Negative negative o - - - - - - - o o
Standard positive o - - - - - - - o o
MD-3 positive o o - - - - - - o o
MD-6 positive o o o - - - - - o o
MD-7 positive o - o - - - - - o o
-
MD-1 positive o o - - - - - o - o
MD-4 positive o - - o - - o - - o
MD-5 positive o o o - - - o - - o
MD-8 positive o o o - - - - o - o
-
MD-2 negative o - - - - - - o o o
Power positive o - o - o - o - o o
MD-9 positive o o o - - - - o o o
MD-10 positive o o - - - o - - o o

Ferrous Sulphate
- major developing agent
- reduces the silver nitrate on to metallic silver
- is not permanent, by air oxidizes on to ferric sulphate (brown color), this process continues in developer if contains only acetic acid

Copper Sulphate
- accelerates developing
- increases coverage
- enhances cleanliness of developing

Potassium Nitrate
- for better of white on the plate

Silver Nitrate
- for better metallic silver on the plate

Acetic Acid
- prevents formation of ferric hydroxide
- know not prevent oxidation of Ferrous Sulphate therefore old developers with acetic acid can have a dark color
- gives a warm tone

Nitric Acid
- prevents formation of ferric hydroxide
- stabilizes of Ferrous Sulphate, the oxidation slows down considerably and therefore have developers with inorganic acid longer of life time
- gives a cool tone

Sulfuric Acid
- prevents formation of ferric hydroxide
- stabilizes of Ferrous Sulphate, the oxidation slows down considerably and therefore have developers with inorganic acid longer of life time
- gives a cool tone
- have a less oxidative influences

Ethanol
- ensures adhesion of developer to the collodion layer

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