methyl green etc

From:Jim Elsam <jim@hteqa.demon.co.uk>

Kathy,

I, too, used to worry about the colour of methyl green until it dawned that,
like so many other dyes, methyl (yes, ethyl) green is a pH indicator and is
supposed to be blue at pH 4 ish.
Indeed, if what you are trying is the methyl green/pyronin method you must
concentrate on accurate pH and let the colours look after themselves!

Good luck.
-----------------------
Jim Elsam
HTEQA Services
7 The Elms, Ringmer
Sussex, UK, BN8 5EZ
Tel: +44 (0)1273 814030
Fax: +44 (0)1273 813290
Visit UKNEQAS CPT at http://www.hteqa.demon.co.uk





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