Every day is a school day for me so I pass it on when I can 
Normally, flame polishing is done with a oxygen/hydrogen torch and you just glaze over the surface of the material, lightly melting the surface. Some shops use MAPP gas or oxy/propane but neither is very clean compared to hydrogen. The heat itself will dull the edge so no need for scraping but many do it, doesn't hurt and does help for some things.
Both provide an invaluable service to many, no need for names, please just a smile and a happy thought if you would be so kind
James
Normally, flame polishing is done with a oxygen/hydrogen torch and you just glaze over the surface of the material, lightly melting the surface. Some shops use MAPP gas or oxy/propane but neither is very clean compared to hydrogen. The heat itself will dull the edge so no need for scraping but many do it, doesn't hurt and does help for some things.
Both provide an invaluable service to many, no need for names, please just a smile and a happy thought if you would be so kind
James