What is the correct term for tiny black spots on coins (see photo):

bigbadchad777

What is the correct term for tiny black spots on coins (see attachment):
It isn't toning it is somthing else.

AuldFartte

Looks like carbon spots to me.

dpoole

Maybe some moisture got on it.

bigbadchad777

Harmful to the coin or price?

longtimecollector

I believe the technical term is "crud"

I've seen similar from bad dips

Catch22

Carbon specks and they effect both grade and price. On that coin I wouldn't be surprised to see a full point drop in grade and a price somewhere around the lower end for the assigned grade.

BigAl

looks like carbon spots. I have both commems and morgans with similar spots. Generally (depending on the environment), dark toning will develop around the spot.

Harmful to the coin or price?

coin - no
price - yes, amount depends on how severe/ conspicuous the spot(s)

clw54

Get enough of those and the seller will call it toning.

Baley

it's got a couple of pieces of "original" on it.

bigbadchad777

Can they develop after the coin has been slabbed?
The coin is graded PCGS MS66.