RE: Newbie in lith print
I found a page saying "...A 10% formalin solution should be equivalent to a 4% paraformaldehyde (by weight) solution...". Concentrated / saturated formalin is 37% AFAIK, not 40%. Anyway, I'll do the math: Since it says 100g 4% paraformaldehyde (4g paraformaldehyde) solution is equivalent to 100g 10% formalin (10g formaldehyde) then you have to use 2.5 units of formaldehyde per 1 unit of paraformaldehyde (10 / 4 = 2.5). Since Christina's formula calls for 37.5g paraformaldehyde, you have to use 37.5 x 2.5 = 93.75g formaldehyde. In 37% solution terms this should make 93.75 / 0.37 ~= 253ml 37% formalin, *if my logic is correct*... I don't know if the information I got from that page is correct and most importantly I'm not sure if my logic is correct. Therefore don't rely on this info ;) Regards, Loris. -----Original Message----- From: Jusdado [mailto:jusdado@teleline.es] Sent: 08 Aralık 2006 Cuma 10:10 To: alt-photo-process-l@usask.ca Subject: Re: Newbie in lith print Hello to all: Chris, as for it formulates it of the ID-85, don't I have paraformaldehide, if of formaldehyde (formol 40%) liquid, which the equivalent quantity that I should use would be?, Thank you and pardon for my English, text translated by computer.
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