What kind of yellow ink did Homer K. Downing use to mark his early coppper coins? Is it destructive

Longacre

I am continuing my frothy frenzy over the Dan Holmes collection of early copper, being presented by the Goldbergs. In one of the lots, the coin was described as follows:

"1794 S-51 R5-. EF-40. Blundered Edge. Five points sharper but recolored glossy chocolate and steel brown with underlying very faded red in protected areas. Covered with a very thin layer of lacquer or similar protectant. No spots, planchet flaws, or contact marks. Sharply struck MDS, Breen state II. A fine die crack extends up from the rim between the 1 & 7 in the date toward the hair above. The edge lettering is blundered, reading "ONE HUNDRED A DOLLAR" and the H & D in HUNDRED are filled in with yellow ink indicating ownership by Homer K. Downing. Called EF45 net EF40 in both census lists. Bland has this piece tied for CC#2 while Noyes says tied for CC#3, his photo #21002. Another great cent with a superb provenance. DWH #0065.
Estimated Value $10,000-UP."

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Does anyone know what type of yellow ink Mr. Downing used to mark his coins? Is the ink destructive in any way?

Aegis3

I believe you'll get better results asking that question here.

Walkerguy21D

I don't think it qualifies as a 'ridiculous question'....but since this particular coin has already been dipped, recolored, and coated with laquer, the the yellow die used to mark two letters on the edge of the coin probably isn't a significant issue....and the Homer Downing pedigree will no doubt bring even more more money at the auction.
I guess a ridiculous question may be 'how do we really KNOW that Homer Downing marked this coin?'

MidLifeCrisis

I don't know the answer to the OP's question...but ya gotta love this part: Estimated Value $10,000-UP.

Justacommeman

If it was a Sharpie I would be suspious