I cant really help you as I've only ever seen pictures of the black swisstools but I cant really see how it wouls help , maybe a small amout but i would have thought it would wear of the tip of the phillips very quickly , Def has a black oxide one , maybe he can help .
I remember seeing a black one on ebay once that was Australian Army issue , it had a serial number and the broad arrow , I wanted that one soooo much
Dunc