Re: gum question

[Judy Seigel <jseigel@panix.com>]

Thanks Loris... Very interesting... Can you give a general idea of how 
long your exposures are? As I recall, in the old books, where potassium 
dichromate was the norm, it was generally used at 5% (apparently why they 
could keep coated paper for weeks before exposing).

Of coure, nowadays -- at least around here -- bigger & faster are better 
(or is that just cars?).  In any event, can you say what started you in 
that direction? Also, maybe you said & I missed that, too -- is this for 
tricolor?

Judy

On Fri, 29 May 2009, Loris Medici wrote:

> Hi Judy, it's ammonium dichromate. (Was shortened as "AD" below...)
>
> Regards,
> Loris.
>
>
> 29 Mayıs 2009, Cuma, 3:30 am tarihinde, Judy Seigel yazmış:
> > On Thu, 28 May 2009, Loris Medici wrote:
> >
> > > I always had better results (due my particular working style and/or
> > > materials?) with weak sensitizers; I use only two dichromate strenghts
> > > 5%
> > > and 2%. (AD, 1+1 gum/pigment+dichromate.) I also have 10% on hands for
> > > unusual situations though.
> > Which dichromate is that, Loris -- potassium or ammonium ??????
> >
> > J.