>From the EMPF HelpLine: One method used is to de-mark the components 
completely. At least one vendor of "micro-blasting' equipment (Crystal Mark, 
Glendale CA 818-240-7520) markets automated/semi-automated systems to demark 
components for users that want a "clean" top. (Some folks like to play the 
"value-added" game and test components then remark with a unique number; 
some folks just want to hide the component so they can crank in some extra 
profit by sole sourcing the replacement parts--bummer). There are always 
questions about ESD with the extra handling and this removal method, but 
there has been some research in this area. We have had a project in the past 
that dealt with ESD/microblasting and we have an engineer that can discuss 
this further if you wish. Call the EMPF HelpLine at 317.226.5616 
(Indianapolis) or e-mail to [log in to unmask]