RE: VDB is "Brownprint" process?

 
It's not Kallitype. It's a Vandyke variation. The sensitizer is same as
Vandyke (green Ammonium Iron(III) Citrate) but the acid is different
(Oxalic Acid, whereas Vandyke formula incorporates Tartaric Acid)...
Kallitype sensitizer is Iron(III) Oxalate and it's a true DOP process.
 
A 21 or 31-step wedge is very helpful in knowing your process. You can
easily determine a standart printing time, you can easily determine the
density range needed for a particular emulsion, you can use it to
compare different emulsions (in terms of speed, contrast), or to learn
the effects of a specific toner (comparing the results of a toned and
untoned print - in a more scientific, objective manner)... and whatnot.
 
I think the $5 21-step Stouffer transmission tablet is more than enough
for the purposes listed above. I prefer to use Mark's 31-step tablet
because you can determine standart printing time a little bit more
sensitively and also it's bigger (especially wider) compared to the
21-step tablet.
 
Regards,
Loris.
 

-----Original Message-----
From: Susan Huber [mailto:shuber@ssisland.com]
Sent: 23 Şubat 2006 Perşembe 15:16
To: alt-photo-process-l@sask.usask.ca
Subject: Re: VDB is "Brownprint" process?

Hi Loris,
I don't have the Jame's book handy right now- it is in the darkroom-
but; is the 'brownprint' called ?"Kallitype"...
I am interested in knowing as I bought the kit over the 'phone' from the
Formulary and will try it out when it gets here in one month.
BTW; does one need a 21 step wedge for alternative processes and how
does one use it?
I went into the store yesterday and found out the Kodak step wedge costs
$144. US and the Stouffer wedge costs $5.80 US- a big difference in
price, any difference in quality?
Thanks so much,
Susan
Received on Thu Feb 23 07:35:41 2006