[alt-photo] Re: Alternative sensitiser

[Christina Anderson]

In the "olden days" they used to do that, to "let it ripen." But this is with gum, and only several days if I remember my research. Kwik Print was a lot more liquidy, very akin to casein-like liquidy. I was very surprised to find out a) it was dichromated and b) it was a polymer.

But this is the other thing: Selectacolor, a similar product to Kwik Print, is a soft gelatin/synthetic colloid mix (proprietary) of 9% with dichromate added (0.2% by weight) as well as ammonium hydroxide (2%). I wonder if (and I am not a chemist so someone can chime in) the amount of ammonia kept it less sensitive until coating, upon which it evaporated.

Chris

Christina Z. Anderson
christinaZanderson.com

On Mar 26, 2011, at 7:16 AM, sam wang wrote:

> Interesting. 
> 
> I seem to remember that KwikPrint came presensitized and kept for a long time. Dichromates seem to trigger gradual hardening and that's why we mix it with colloids just before use (and toss if left over). Or is that a myth? Has anyone kept sensitized solutions for later use? If so, for how long?
> 
> Sam Wang
> 
> 
> On Mar 25, 2011, at 10:56 PM, Christina Anderson wrote:
> 
>>>>> 
>>>>> A somewhat related question: does anyone know the chemical make-up of
>>>>> KwikPrint? It was popular in the 70's to the 80's. First made for proofing
>>>>> print jobs and them sold by Light Impressions for alt printing. Best results
>>>>> when used on a king of vinyl that comes with it. Are there no old timers on
>>>>> the list who can shed light on it? Seems that it was akin to casein and used
>>>>> diazo as well.
>>>>> Sam Wang
>> 
>> Sam,
>> I was able to ask someone at SPE the chemical makeup of Kwik Print and it was a dichromated polymer solution, not casein, not diazo.
>> Chris
>> christinaZanderson.com
>> 
>> _______________________________________________
>> Alt-photo-process-list | http://altphotolist.org/listinfo
> 
> _______________________________________________
> Alt-photo-process-list | http://altphotolist.org/listinfo