Digital BW, The Print

Hello guys, I just wanted to add a comment regarding bleaching.   There is a 
better bleach that does not degrade the image over time and it will bleach to 
white. Ferrocyanide based bleaches of course cant do that. The bleach I am 
referring to is a    combination of Thiourea and Iodine. This bleach can be used 
in any dilution for either slow bleaching or rapid bleaching. It will remove 
the blackest black and leave no residue in the paper. It will bleach to white, 
not to the yellow color that ferrocynide will. To nutralize this bleach 
rapidly just apply a wash of diluted acetic acid stop bath in the area bleached and 
then wash the print for a normal amount of time.   The bleach will be inactive 
and will not degrade the image over time. Thiourea must be mixed carefully 
beacuse any residue can affect prints so clean, clean, clean and dont be sloppy. 
As far as mixing the bleach, it is mixed in two parts, thiourea in one bottle 
and Iodine in the other.When used mix the two parts together and test to see 
what the bleaching effect will be. Over time you will get a feel for this 
bleach and the results are wonderful. Use an eyedropper to mix the two solutions. 
The two solutions will last for years in there separate bottles. Only mix 
small amounts as needed. I hope that you find this a help.   Steve


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