Prussian blue is for depressed Teutonics machinists. Get some water based
marking compound from Dapra
http://www.dapra.com/biax/scrapers/accessories.htm

MSC will drop ship it for you.

Starrett seems to scrape their precision levels so the base is not flat, but
has a gentle curve so the bottom actually hogging. If you want a flat base
you would have to grind or scrape yourself, thats what I did.

Tony


"geebee509" wrote in message
ups.com...
I have a Starrett precison level I think is not perfectly flat on the
bottom.
What is the proper procedure for checking the flatness of a part using
a surface plate? For example:
Do you coat the part with Prussian Blue? How, a finger tip, what
thickness?
How do you test it on the surface plate - press it down gently, slide
it, rotate it, what?
How would you prepare the surface plate - clean with alcohol, use a
damp kem wipe, what?
Do you test flatness on different sections of the surface plate?

I hope these are not to basic. Any other hints, tips, cautions, would
be sincerely appreciated.

Gil