From: Sam Wang (stwang@clemson.edu)
Date: 07/04/01-07:45:40 AM Z
Shannon,
Yes, the color is probably from humidity, especially when combined
with heat with long exposure. Most of it goes away with a longer
soak. Otherwise it is permanent.
Use a small fan to dry the paper before exposure and to remove heat
from the UV unit.
Sam
> I made some cyanotypes today from some really dense negatives. At
>least, I think they must be really dense because they look dense and they
>took 30 minutes to expose to get anything close to Dmax under the black
>lights. (I don't have a densitometer here in TN.) Something weird happened
>on two of them: in the lighter areas, there is a sort of lilac color,
>unlike the light blue of the normal light areas. What causes this? The
>other variable, besides the long exposure, might be the really, really high
>humidity--about 95% at night. My paper fogs while it is drying after I put
>the emulsion on it. (And it takes a long time to dry. I help it along a bit
>with the hair dryer sometimes.) Is the lilac color a symptom of fogging?
>
>--shannon
This archive was generated by hypermail 2b30 : 08/02/01-11:56:46 AM Z CST