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Thread: Thumb test -- how does it work?
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11-10-2009, 06:00 PM #11
Forum member Randydance suggested to me to take a new DE or SE blade and practice the TPT on that. This worked very well for me. YMMV. I don't know why it is suggested to moisten the thumb with the TPT or the thumb nail with the TNT but I suspect it is to lubricate the surface. Less chance of a false positive ? In the barber manual excerpt it specifically says not to use saliva. There may be corrosive properties in it that could damage the edge if it were not completely removed.
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