I have done experiments with Hematite (get it at Tiranti's close to Euston square) and heated steel + motor oil. I can't remember what I have done here but it should be possible to discolour your mudguards
Basically heated it to as hot as you can and dip it in oil?
Yes that's the dangerous and fun version. But I am pretty confident hematite will work as well.
@edscoble started
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I have done experiments with Hematite (get it at Tiranti's close to Euston square) and heated steel + motor oil.
I can't remember what I have done here but it should be possible to discolour your mudguards