Re: (Gum) Tonal scale

Dear Yves.

I have used a one(1%) solution of sulphuric acid to clear the brown
dichro stain for the past twenty years with no ill effect in both Gum
and Temperaprint.

Best wishes

Pete

On 6 Dec 2005, at 00:38, Yves Gauvreau wrote:

> These are very interesting results Katharine, thanks for sharing them
> with
> us.
>
> I ear that some acid (sulfuric acid maybe) could help to clear the
> dichromate, I'd be curious to see or ear about a similar test using
> it???
>
> Thanks
> Yves
>
>
>
> ----- Original Message -----
> From: "Katharine Thayer" <kthayer@pacifier.com>
> To: "alt photo" <alt-photo-process-l@sask.usask.ca>
> Sent: Sunday, December 04, 2005 9:50 AM
> Subject: Re: (Gum) Tonal scale
>
>
>> I accidently sent this to myself instead of to the list, (still
>> figuring out my new mail program) so I'm sending it again, to you.
>>
>> On Dec 3, 2005, at 1:00 PM, Katharine Thayer wrote:
>>
>>>
>>> After I wrote that about dichromate stain, I remembered that I have a
>>> page showing the color of unstained gum, of dichromate-stained, and
>>> of
>>> cleared stained gum, on my site; here it is if anyone is interested:
>>>
>>> http://www.pacifier.com/~kthayer/html/gumcolors.html
>>>
>>> The samples don't show different tones, because it was gum that was
>>> exposed without a step tablet or any kind of negative, just hardened
>>> gum. that's when I was working on that project of making gum for
>>> chemical analysis.
>>> kt
>>>
>>
>
>
Received on Wed Dec 7 01:12:58 2005