For your first question try http://www.google.com (http://www.google.com)
. I got 11,000 hits using the keywords drying agent acetone.
Flashing with acetone: When evaping the water or alcohol off of meth or pseudo using low heat, then adding acetone just before all the water or alcohol has evapped.
Rinsing with acetone: Can be done in a filter and funnel or in a dish or beaker. Either way you are adding acetone and then removing the same acetone either by filtering it or decanting it.
Swid thinks this is a great site but the lack of details is the only things that needs to be worked on. Swid thinks that there is too much assumming go on.
Well we do in fact assume our members have at least a 6th grade education. Appearently we assume too much.