RE: VDB

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

See?

Anyway, since FAC is an ill-defined compound, you may experience this
with later batches and/or I may not experience this with a new batch
from B&S...

That's one of many reasons of why I like New Cyanotype -> it uses a
well-defined compound as sensitizer; Ammonium Iron(III) Oxalate will
always be exactly the same (w/ predictable/consistent behaviour)
whatever supplier you prefer to use.

Regards,
Loris.

-----Original Message-----
From: Sandy King [mailto:sanking@clemson.edu] 
Sent: Monday, November 05, 2007 1:34 AM
To: alt-photo-process-l@usask.ca
Subject: Re: VDB


Loris,

My FAC was purchased from Artcraft. No idea as to the original source.

Sandy



At 10:34 PM +0200 11/4/07, Loris Medici wrote:
>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?