|
Name of Developer |
Process |
Ferrous |
Copper Sulphate |
Potassium |
Barium |
Silver |
Formic |
Nitric |
Sulfuric |
Acetic |
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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