Re: (Gum) Multi prints???

I've had best results printing gum with negatives that would be "perfect"
for use with Grade 2 silver gelatin paper. With my methods and printing
preferences, a negative with 0.7 density range would be a bit flat, but
certainly not unusable. Also consider whether Potassium or Ammonium
Dichromate is being used, that will make a noticeable difference.

Dave Rose
Powell, Wyoming

----- Original Message -----
From: <TERRYAKING@aol.com>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Tuesday, December 13, 2005 3:24 PM
Subject: Re: (Gum) Multi prints???

>
> In a message dated 13/12/2005 19:30:27 GMT Standard Time,
> gauvreau-yves@sympatico.ca writes:
>
> Terry,
>
> You are the one that caused me to ask this question again. When I read
the
> 0.7 density you mention here and on your web site, after seeing up to
1.20
> from other source and from the number I got from my own test, all this
got me to
> question the hole process. Was it because it as always been done that way
or
> is there some logical explanation for this multiple exposure stuff.
>
> I think I like best Toms explanation so far.
>
> Thanks
> Yves
>
>
>
>
> Yves
>
> 2.8, 1.2, 1.0 are all densities for negatives you could use for making
a
> gum print. If you want a negative that is going to give you the best
gradation
> 0.7 is the ideal density range for gum. Each of these processes has an
> ideal negative. If you use a negative of anything other than that ideal
range you
> will either have to stretch or compress that gradation whivh reduces the
> quality of the print.
>
> Clearly that ideal negative, 0.7, for gum printing is not going to
produce a
> very exciting image. Accordingly you have to give multiple printings to
> build the contarast. If you make a normal print and then repeat the
printing on
> top of the first, the highlights will stay much the same while the middle
> tones will become darker and the shadows darker still. Using the method I
> suggested makes this process easier.
>
> This is not theory. This is simple, practical, demonstrable fact. If you
> were to come on one of my gum workshops I would show you.
>
> Where are you ?
>
> I do not know what Tom said but if it cannot be interpreted in this way
you
> are being given a bum steer.
>
> Terry
>
> Terry King FRPS
Received on Tue Dec 13 20:39:59 2005