Archived posting to the Leica Users Group, 1999/08/18

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Subject: [Leica] Re: Pyro from off list kinda long
From: George Huczek <ghuczek@sk.sympatico.ca>
Date: Wed, 18 Aug 1999 07:53:06 -0600

At 07:30 AM 18/08/99 -0600, you wrote:
>>> You should use about 0.05 g of amidol per 500 mL of working strength
>developer. 
>
>Sorry, a typo.  The correction should read:
>
> You should use about 0.5 g of amidol per 500 mL of working strength
>developer. 
>

Doubly sorry here, the original post was correct.  0.05 g is right.  0.1 g
of amidol is the recommended amount per litre of developer, so in 500 mL
batches half of 0.1 g is 0.05 g.  The math ...
0.5 g is not right ... it is way too much.

As far as adding it goes, if you use amidol you'll see how easy it is to
estimate small amounts with it.  It's a very fine crystalline powder, and
if you have a tapered scoopula you can measure out small amounts of it with
fairly good accuracy after a while.  The only drawback is the cost of
amidol -- not cheap.