[NHCOLL-L:585] weak acids for degreasing bone

[RWhite at safariclub.org]

Paula,

I haven't ever used weak acids for degreasing bone.  I don't think it is a
good idea, as getting all the acid out of the bone might be difficult, and
leaving any in would result in eventual deterioration.

I have used ammonium hydroxide to degrease, particularly when there is red
marrow present.  It works well, and quickly, but again, you have to get all
of it out of the bone to avoid eventual problems.

The best way to go is to use a high-speed (fast) automobile lacquer thinner.
It is flammable, and needs to be used carefully, and with adequate
ventilation, but is certainly the most efficient degreasing agent.  It is
best not to use virgin degreaser on small or lightly greasy specimens, as
they are left too white.  You want to leave some lipid content in the bones,
as it prevents cracking.  Usually, I simply degrease well and do not bleach,
as bleached bones are so white that subtle surface details such as muscle
attachments become very hard to see.  And I'm sure I don't have to warn you
NEVER to use sodium hypochlorite (Clorox or other laundry bleaches) unless
you want a pile of chalk dust in 5 years............

Rich White
Curator
International Wildlife Museum
Tucson, Arizona