Ptolemaic Gold Coinage Deposits

I recently added this coin (N#453655) and was wondering about what you guys thought the deposits on the coin itself were. Just Dirt and mud? 

Auction here: https://www.numisbids.com/sale/8945/lot/57

Are you scrupulously drumming up interest in your coin because you are trying to sell it, or are you interested in buying it?

King, I appreciate you believe I have the means for either but no I am not. I am a University Student. I am simply trying to figure out what the deposits are. I think it's probably mud but I am not sure. Normally, If I saw that on a coin I am looking at, I would think it is either improperly cleaned or a counterfeit. 

😂😂 well you do have a gold sovereign as your profile photo, we can all dream about owning these gold coins…

As the coin in question is so old, I imagine it is probably deposited dirt from being hidden or buried somewhere. A restorer would be reluctant to try too hard to remove such deposits if there is a chance of damaging the coin, however it is unusual on a gold coin as gold is the least prone to such buildups of crud. Perhaps there was a inconsistency in the purity in this area which led to such a buildup (If that is what it is), however I don’t own enough gold to give a more definitive answer.

King

😂😂 well you do have a gold sovereign as your profile photo, we can all dream about owning these gold coins…

 

As the coin in question is so old, I imagine it is probably deposited dirt from being hidden or buried somewhere. A restorer would be reluctant to try too hard to remove such deposits if there is a chance of damaging the coin, however it is unusual on a gold coin as gold is the least prone to such buildups of crud. Perhaps there was a inconsistency in the purity in this area which led to such a buildup (If that is what it is), however I don’t own enough gold to give a more definitive answer.

Those sound reasonable I suppose. Wouldn't want to hurt the coin and this is a foreign mint. The Sovereign in my photo is not in my collection unfortunately :( One day, hopefully when Gold is way down (I have been saying that delusionally for several years now)