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I fell on knee causing a white spot on my good black pants, how can I fix t?

I had on my best black slacks and tripped and fell on knee on sidewalk. I didn't tear pant leg, but the knee area has a white spot (like it was burned on sidewalk) and I don't know how to fix.
Black Beauty, August 2008
use a permament marker pen from spotlight cover erea not to heavy at first then set with a warm iron. repeat till cover matches pants this may work depending on material blends

irene, April 2009
Smear it with marmite.

bleep, September 2008