From: Katharine Thayer (kthayer@pacifier.com)
Date: 05/21/01-01:39:36 AM Z
Boy, I don't know how we got from there to here, but I've never said
Kosar had ANYTHING to do with disposal of dichromates. I've never,
except once when responding to Judy's question about whether you could
render hexavalent dichromates benign by zapping a dishpan full of them
with sunlight, been talking about disposal of dichromates, and I didn't
refer to Kosar in that post. We've got a couple of threads crossed here.
I've been talking about the gum tanning process at all times. They do
interact, but they're not the same.
Katharine Thayer
Judy Seigel wrote:
>
> A 2nd trip through dichromated colloids per Kosar has, for better or
> worse, left my prior opinion standing. While there surely could have been
> info that actually addressed our problems but were missed by me in my
> state of chemical ignorance, I found few possibilities. The material is
> concerned with sensitivity, dark reactions, and keeping qualities. In
> 1965, disposal was a non-issue. True, we can extrapolate -- theoretically.
> But such extrapolation is exactly what I have found by practical testing
> to be vastly wide of the mark, even backwards.
>
> Which is to say, if Kosar is the likeliest source we have in print on the
> topic of disposal of dichromates, as Katharine seemed to indicate, we are
> indeed flying blind. Nor do I find a chapter in which every 3rd or 4th
> sentence includes, and I quote: "It can be assumed...." "Generally we can
> say.... " "it can be expected...." "is generally accepted..." "possibly as
> a result of..." "possibly due to..." "It appears most probable..." "It is
> believed that..." "It is generally believed that..." "Most authorities
> agree..." "we can reasonably assume..." "It was reported that..." and so
> forth, a better guide than the daily horoscope.
>
> Kosar has done little if any of it himself of course, but excerpts
> findings from no less than 170 books, articles and patents, each with
> different premises and protocol, and with often contradictory results. It
> is generally not stated which colloid the "finding" refers to, and those
> that are cited are mostly dichromated gelatin. The only reference to gum
> arabic is a short section of definition. Since I found several statements
> I knew to be NOT true in the matter of dichromated gum, although the
> hexavalent to trivalent feature (scarcely hinted at here) may be constant,
> perhaps I will be forgiven for lack of faith.
>
> Disposal of dichromate is a timely and important issue, but it seems to me
> the answers are yet to be coherentized.
>
> Judy
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