Gummy metals cut better when marked with Sharpie or glue

[Toolmaker51]

Just about anything will generate the effect; contaminating the bond of heated material to parent, or cooling the swarf below a temperature willing to adhere.

Lab experimentation demonstrates an effect, yet probably far lower than what would occur in a production environment. Everything comes into play beyond material alone, depth of cut, feed rate, RPM, cutter type, distribution and coolant variety, just for starters.