A developer with a higher concentration of dichromate affects all densities to some extent, but primarily highlight densities first, then mid-tone densities, and finally shadow densities. Normally in adjusting the contrast of a negative with the dichromate control method there is no need to change exposure. However, if you need to add dichromte beyond about 8ml of a 5% solution per liter of developer you might have to add some exposure time to compensate for density loss.

Sandy

Quote Originally Posted by Shinnya
Sandy,

Thanks for clarification about the amount of Dichromate. The amount you mentioned is the exact mix that I am using.

One question. When you change a developer to a developer with higher concentration of dichromate, does it affect highlight or shadow? That is also what I would like to confirm.

Thank you again.

Warmly,
Tsuyoshi

p.s.: DR is a little bit beyond my capacity since I cannot measure my negatives yet... Is that something I can measure with step tablet?