wax for KOH etch

[davehong at aol.com]

Dear lab members,
 
    I am looking for product names and manufacturers of different types of waxes that can be used to protect wafers during KOH etching.  I understand that there is a black wax and a white wax.  What are their product names and where can I buy them?
    Your feedback is much welcomed.
 
best,
 
Dave 
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