Re: bichromate gum

[Judy Seigel <jseigel@panix.com>]

On Sun, 13 Jul 2008, Christina Z. Anderson wrote:
> But, Kosar shows the speeds of the different dichromates with albumin, gum, 
> and process glue and there are some variations in speed with the colloid used 
> I find quite interesting--albumin being slower to harden with both pot and 
> sod than the other two colloids although with am di it is not (53). This may 
> also explain some differences of opinion as usual--different gums might react 
> differently due to pH or some other factor.  And the weird thing is that with 
> gum and process glue, it appears from his chart that sod and am are equal in 
> speed, but with process glue am di is faster.  However, in practice when one 
> uses a 5 or 6 minute exposure time, these variations probably don't matter 
> because one always suits practice to what's on hand.
Good grief -- I wouldn't trust Kosar, or anyone else including my fairy 
godmother to give -- or show -- me that data... There is NO substitute for 
your own tests with your own ingredients (including the paper, your body 
pH and your personal virtue). Since those tests with a 21 step or whaever, 
are so much easier than reading Kosar (not to mention FINDING it) and 
especially since as I recall Kosar never said much besides "probably," or 
"presumably" about anything, ESPECIALLY about gum printing. Most of what 
he talks about is carbon -- and simply describes his own surmises from 
tests by OTHER people.

That's info ???

Of course I've done this rant about Kosar a couple of times in the past 
(which may be why some alt lister snuck into my house & stole it).

Incidentally the tests I did with na di those many many years ago were 
with the chemical sent to me by someone on the list, from California if 
memory seves, and who knows what California does to chemicals...NY may not 
be as mean -- or meaner !

cheers,

Judy