Developer formula for developer

D-23

Clear water (52℃) 750ml

Methaminophen (Mitol) 7.5g

Anhydrous sodium sulfite (Sulfur culture) 100g

Add cold water to 1 liter

(Do not mess up the order)

Medicine solution introduction: D-23 is an old-fashioned soft-tone developer liquid. Methaminophen has a greater effect on underexposed silver halide, causing the density of shadow areas to increase rapidly and the density of bright areas to increase very slowly. The resulting film has very low contrast, which is why Mitol is almost always paired with high-contrast hydroquinone to make it a normal-contrast developer. Even if the development time is greatly extended to compensate for the underexposure, D-23 will not make the highlighted areas appear too thick. If this happens, we can conclude that any other solution would be much worse than D-23.

Clear water (52℃) 750ml

Methaminophen 7.5g

Sodium sulfite (dry powder) 100g

Sodium bisulfite 15g< /p>

Add cold water to 1 liter

Medicine solution introduction: D-25 formula has the advantage of extremely fine silver particles, but the exposure requires a higher level to compensate for the time it takes to dissolve the silver particles. Due to the loss of sensitivity, underexposed films should not be used. The sodium bisulfite in the formula is easy to deliquesce and become invalid, so it brings certain shortcomings.

D-76

Clear water (52℃) 750ml

Methaminophen 2g

Sodium sulfite (dry powder) 100g

{Hydroquinone (guinone)

Sodium tetraborate (borax)

Add cold water to 1 liter

Pharmaceutical introduction: D -76 is a standard developer. Photographers who use this developer generally purchase the developer powder configured by Kodak directly. It is a mid-level particle formula with clear development and moderate contrast. It has good performance on the gradation of shadow parts. The exposure time does not need to be increased. The development latitude is large. It is a universal and standard particle developer. However, this kind of developer is sensitive to the bromide produced during development, which will gradually slow down the development speed. A better way is to add supplementary fluid to maintain stability.