From: Sandy King (sanking@hubcap.clemson.edu)
Date: 12/28/00-03:44:46 PM Z
First, your 3.5% dichromate solution for a negative with a DR of 1.9
sounds about right to me so I don't have any reason to suspect the problem
lies there.
Although I am not familiar with your materials it would appear that you are
using far too little pigment. I typically use between 40-60ml of Sumi Ink
per 1000ml of solution, and often add other pigmets for different tones. As
a first step to solve your problem I sugest you double or even quadruple
the quantity of pigment per 1000ml.
There is no reason to settle for weak blacks with carbon if you want strong
ones. Carbon is capable of Dmax values as high as those of silver-gelatin
prints.
Sandy King
>Dear list friends,
>
>I have been experimenting some time with carbon
>printing and I am easy geting the prints without any
>major flaws. My pigment is 10 ml of Rowney
>Kandahar black indian drawing ink per liter of 10%
>gelatin solution. I did also some tests with 2 g carbon
>black powder per liter of solution. My negatives have
>a density range of 1.9 and the sensitizing solution is
>3.5% potassium dichromate.
>
>My question to the carbon printers is:
>
>How do you get good blacks?!!
>
>My silver prints have much better blacks then carbon
>prints made on the same fixed out paper.
>Should I just take it or leave it?
>
>Thanks,
>
>Kemal, Sweden
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