degreasing

[Andrew Warren]

On Sun, 13 Jan 2002, Ron Gatrelle wrote:

> 
> ----- Original Message -----
> From: "Mark Walker" <MWalker at gensym.com>
> To: <leps-l at lists.yale.edu>
> Sent: Sunday, January 13, 2002 5:45 PM
> Subject: RE: degreasing
> 
> 
> > The most serious case of the phenomenon described by Richard Worth that I
> > have seen occurred on a very large Pierid I caught in Rishikesh, Uttar
> > Pradesh, India in 2000.  I relax with only water, so Stan's suggestion
> > wouldn't apply.  The bug was big and white - with black stripes and a
> slight
> > bluish tint.  I thought I had spilled ink on the wings at first - the
> > blue-green staining ran like water colors.  There was significant
> > condensation in the relaxer, and it was little drops of water that were
> the
> > culprits.  I hadn't seen this before - at least not to this extent.  It
> was
> > almost as if the bug was painted, and I was ruining the masterpiece with
> > exposure to water.
> >
> > I have no idea what chemical is responsible, but the secret is clearly
> > keeping the specimen away from condensation.
> >
> > Mark Walker.
> >
> 
> One might try water without ammonia, chloramines, or chlorine.  What comes
> out of the tap is pretty chemical laden -  unusable as is for fish.  Treat
> your tap water with something like AmQuel first and see what happens on a
> disposable specimen.
> 
> Ron
> 
Andy here:

	I have seen these spots on worn and tattered (even a few fresh)
 pierids in the field in the tropics many times - presumably caused by
rain droplets or condensation; so I doubt that using
pure water without any chemicals in the relaxer would solve the problem.    

Andy Warren

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