I used the white wheels and found that they wore and grooved far too quickly
for my tastes. Now I use a regular aluminum oxide wheel, 80 grit. I think,
and it is only my personal opinion, that any of the regular commercial
wheels have a fiable enough bond for good turning use. I have not used the
blue wheels. Note that the white, blue, etc colors are just a manufacturer's
coding system. The cutting material is still aluminum oxide.

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God bless and safe turning
Darrell Feltmate
Truro, NS Canada
www.aroundthewoods.com