[alt-photo] Re: ammonium dichromate

[Dave S (fotodave)]

Well, the label says 0.5 to 3.0% water. Given it is not precise, you cannot
be very precise either.

I believe the percentage is percent weight. With 3% water, the percentage of
dichromate is 97%, or 0.97. If your formula needs 15gr dichromate, you would
change it to 15/0.97 = 15.46gr.

But if the water is 0.5%, the dichromate is 99.5%, or 0.995. For 15gr
dichromate, you would use 15/0.995 = 15.08 gr.

So your new formula would need 15.08gr to 15.46gr dichromate per 100 ml
water. I don't know if you need to be that precise.

If you really feel you need to make such adjustment, maybe you can use a
value in between 0.5 and 3.0, say 1.75%.


Dave

-----Original Message-----
From: alt-photo-process-list-bounces at lists.altphotolist.org
[mailto:alt-photo-process-list-bounces at lists.altphotolist.org] On Behalf Of
jusdado
Sent: Tuesday, January 31, 2012 3:46 PM
To: The alternative photographic processes mailing list
Subject: [alt-photo] ammonium dichromate

Hello to all
I have bought a new lot of Dichromate Ammonium, but their aspect is
different to the one that I use. It is not crystallized. It is powder. I
check that in the label says "moistened with 0,5-3,0% of H2O PRS. I imagine
that I will be able to use it, but the solution will no longer be same.
For example: i make solution to 15%, but now..... what quantity of
dichromato and waht quantity of water to make the same solucition to 15%?.
Thank you and pardon for muy English, text translated by computer.

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