Sharpie trick?

you draw on the edge of the blade with a sharpie, and run it across the stone, if sharpie on the bottom of the edge is gone then the angle is to steep, visa-versa if the sharpie is gone on the top of the edge, but if all of the marker is gone then you have the correct angle.
 
What he said ^^^

To get off the extra ink, above where the material is removed, use rubbing alcohol.
 
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