[meteorite-list] Cleaning Meteorites - lichen problem

From: Jake Baker <bakers5acres_at_meteoritecentral.com>
Date: Sun, 15 Feb 2009 09:45:09 -0700
Message-ID: <FB9025875AEE4A13B3193E5BFDB296C0_at_barb2>

Does anyone have a suggestion about removing lichen from a specimen and
discouraging regrowth? How do scientific organizations & museums do it?

The specimen is unclassified and assumed to be a stoney, very dense, high
silicate, low iron, with lots of olivine.

This piece came from the US near the Great Lakes and has green and silver
lichen. I've tried dish detergent, vinegar, denture cleaner, peroxide,
ultrasonic cleaning, water pick, brushing, and various combinations of
these. I've even tried oven drying to discourage regrowth.

I'm hesitant to try other chemicals for fear of damaging the piece. I have a
feeling balancing the PH will discourage regrowth.

Pictures available if needed.

Thanks to anyone who answers.
  
Received on Sun 15 Feb 2009 11:45:09 AM PST