cyanotype new kit formulary

[drh]

hi. i'm experimenting with cyanotype for the first time, the new formulary kit by dr. ware. how can i tell if i have over or under exposure after the rince?
what is the difference in aesthetic between over and underexposure after the process is complete? are there any significant changes in the chemical to let you know when the print is ready to be rinsed? any ideas would be greatly appreciated.

 

[MDR]

Underexposed cyanotypes will be quiet light and will remain lighter (the blue tone is somewhat turquoise), overexposed cyanotypes (less of a problem) usually don't have clean whites they are a bit muddy. A good way to see the final results is to add a bit of acetic acid to the water or a bath in 0.3% Hydrogen peroxide. Before the print can/should be rinsed the darkest part (equal to black) of the print should have some solarization (brownish-blue/green). An underexposed cyanotype has as mentioned before a trurqoise sky blue color whereas an overexposed print has a darker blue way too much exposure creates solarization in the midtones that can't be removed trough rinsing.

Good luck

Dominik