Forums Beginner Questions Contaminated Lap?/Over Cutting Facets During Polishing Reply To: Contaminated Lap?/Over Cutting Facets During Polishing

#6671

Alan Balmer
Keymaster
@alanbalmer

Don’t know why this mixture ends up going black but it does.

Swarf is always black, in my experience – nothing to do with a particular lubricant. Probably because nanoparticles of stone in lubricant don’t reflect light.