Amber Listserv / copal test

[glen]

hello andy, I would like to share my test method.  I prefer to test with pure acetone and I always put a drop on one spot, wait a couple of seconds and then remove the acetone. Then I put another drop on the same spot, wait several seconds and then I rub the area with my finger. ( wearing rubber gloves of course ) I then look at the surface, using 10x,  of the material to see if there has been any changes in the surface. In the past I have found that a quick test can seem like there has been no change in the surface when in fact the change was slight. glen
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