Re: VDB

[Loris Medici <mail@loris.medici.name>]

Sandy, who's green Ammonium Iron(III) Citrate do you use? Not B&S's I  
presume - because mine from B&S does indeed cause sludge formation  
right after mixing the sensitizer. I leave it there for two days  
ripening period (occasionally shaking the bottle, 2 - 3 times a day)  
then filter it out before using the sensitizer. A little more sludge  
precipitates even after that but since the amnt. is not important (a  
mm or so precipitation in the bottom of the 250ml bottle) I leave it  
there and take the sensitizer with a plastic pipette w/o disturbing it.

I'm happy with my single coat Vandykes as long as I tone them with  
thiourea-gold toner. I'm not happy with my untoned Vandykes unless I  
double coat.

Regards,
Loris.

Quoting Sandy King <sanking@clemson.edu>:

> I never get any sludge!! Not after 24 hours, not after 24 days.
>
> After several months the silver coats the side of the bottle, but the
> solution remains clear.
>
> Are you mixing with distilled water?
>
> Sandy
>
>
> At 2:44 PM -0500 11/4/07, Weber, Scott B wrote:
> > Speaking with a friend who also makes Van Dyke prints I mentioned that I
> > filter the "sludge" that forms at the bottom of the bottle after 24 hours
> > when mixing a new batch of solution. He said that he never does this. Are
> > there any VDB printers out there with opinions on this? Filter or no filter?
> >
> >
> > Scott B. Weber
> > Associate Professor of Photography
> > Department of Fine Arts
> > Barry University
> > 11300 NE 2nd Avenue
> > Miami Shores, Florida 33161
> > (305) 899 4922
> >
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