- Mar 24, 2011
- Reaction score
- UK, West Midlands
I beg to differ. Well actually, not to put too fine a point on it, that is utter rubbish.As noted the high spots should be bright with the low points filled In with blue. It is when you have a tiny difference between high and lows that contrast becomes a problem.
1) You take a tiny amount of blue on the tip of your index finger and spread it, with the finger, evenly over the whole area of the surface plate.
2) The high spots on the workpiece touch and are marked with blue. The low areas don't touch and are left bare. 3) Scrape where the blue is.
4) Wipe off the work and redistribute the remaining blue on the plate, and repeat from 2
5) When the high spots are too faint, repeat from 1