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Looks like oxidation. That is what happens when aluminium isn't properly protected from the elements. Only happens on the top layer. It isn't dangerous, but it is ugly.
Fatbiker-
Cheers for putting my mind a bit at rest. I suspected it was okay after a bit of sanding, so going to clean it up a bit & then get some clearcoat on it to protect it a bit better. Either way of resolving this (getting a new fork, trying to sort of this one) isn't going to be pretty, & with the dings in this frame already it's been destined to be a rat bike for a while.
GideonPARANOID
Hmm, bubbly paint on the fork crown of the MASH & a bit of white aluminium crustiness. I drilled it for a brake when I first got it, & I guess some wet got under that paint. Instant write-off? Will give it a sand & see what's up underneath.