burn dammaged oak desk

This had been a workshop desk in a foundry, there were several deep burn marks across one end of the top where a very hot metal impliment had been rested over and over again, we were required to remove as much of the evidence of this dammage as possible, as the burns were upto 6mm deep we couldnt remove them completely without making the top considerably thinner, so we sanded localy to the dammaged area and bleached the burns out to disguise them, then restaining and repolishing the whole desk.