Re: Vandyke Question
Adding tartaric acid would help, except that it would also decrease
speed. Nuking it in the microwave is the better way to go - try 15
seconds.
Sam Wang
On Feb 22, 2008, at 6:34 PM, Joseph Smigiel wrote:
Try adding a bit more tartaric acid to get the silver precipitate
back into solution. Add just enough to re-dissolve the precipitate.
Joe
___
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On Feb 22, 2008, at 6:19 PM, Scott Wainer wrote:
Good day List,
I recently decided to print some images in vandyke and found a 2
year old bottle of sensitizer hidden on the shelf. Thinking it was
too old to use, I mixed up a new batch only to find that when I
added part c the sensitizer turned cloudy and eventually separated
with a clear liquid on top and a grayish tan sludge on the bottom.
I tried making a second batch thinking I added part c too fast but
I got the same result. I thought the water I distilled might have
been contaminated so I tried again with store bought distilled
water and it happened again. Frustrated, I ordered all new
chemicals from Artcraft and tried again today - same result. If I
let the sensitizer sit for 24 hours then filter it I get a clear
liquid which lacks contrast and is rather thin density wise.
Anybody know what's going on here?
My formula is:
Part A
9 gm - Ferric Ammonium Citrate
33 ml - distilled water
Part B
1.5 gm - Tartaric Acid
33 ml - distilled water
Part C
3.8 gm - Silver Nitrate
33 ml - distilled water
Mix parts a, b, & c separately. Add part b to part a slowly with
constant stirring. Add part C very slowly with constant stirring.
Any help would be greatly appreciated.
Best to all - Scott
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