Archived posting to the Leica Users Group, 2005/12/02

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Subject: [Leica] Xtol temperature
From: ericm at pobox.com (Eric)
Date: Fri Dec 2 16:25:38 2005
References: <6613D255-682E-4F9F-AB7D-330E1E6E8517@earthlink.net>
 
Maybe I'm missing something.

Lately, I've been using Xtol 1:1.  Which makes temperature calculations a
breeze.

I develop at 20 C.  68 F.  293.15 K.  First, I measure my stock solution of
Xtol.  Lately, that's been running around 18 C.  So, I adjust my tap until I
have 22 C water coming out.  Pour Xtol into graduated cylinder.  Pour same
amount of water into cylinder.  Presto...exactly 20 C developer now.

Same concept as when I was using 1:3.  Xtol at 18 C.  Water temp = (20 C -
.25 * 18 C ) / .75 = 20.7 C.  Presto...exactly 20 C developer.

No water baths.  No nothing.



--
Eric
http://canid.com/