Digital BW, The Print

"slightlyoutoffocus" <by_design@...> writes:

> I don't recall any rules for ammonia, but there is one for acids.  It 
> is, simply, AAA...always add acid.  I would guess the same would 
> apply for ammonia.

Sometimes considerable heat can be generated.  This can cause a dolop
of *stuff* to fly around the room.  Since you combine dangerous things
slowly and carefully (you do, right?), there's a lot more of the stuff
being added *to* available than there is of the stuff being added.  So
it's safer to add the relatively more dangerous stuff to the
relatively less dangerous stuff. 

Except, no doubt, in various special cases (me no chemist).
-- 
David Dyer-Bennet, dd-b@...  /  http://www.dd-b.net/dd-b/
 John Dyer-Bennet 1915-2002 Memorial Site http://john.dyer-bennet.net
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