Bronze disease?

[ambr0zie]

Hello ladies and gentlemen,
Acquired a batch of coins from an auction - being a freshman in this area, I find that studying and identifying coins extremely exciting (although I still ask for help in this forum when I am stuck)

From the last batch, 2 coins have a green deposit - could you please confirm if this is bronze disease and if this is possible to be removed? Or in fact, if it needs removing.

Many thanks in advance.

[dwarf]

Judging just by these photos.

I don´t see bronze disease
But:
Patina on first coin may be artificial which then may hint to a forgery (although being e very common coin)

Regards
Klaus

[okidoki]

i agree with Klaus

[ambr0zie]

Thanks gentlemen.
In this case I will leave them alone.
Even the Nero coin is OK?
Washed it a little with hot water and soap and the deposit started to come out (barely) using a toothpick - but i don't want to ruin the coin by scratching it, even if it's in poor conservation I like it.

If you think that the green deposit doesn't harm the coin in any way I will leave it as it is.

[SC]

I don't think it is BD and I don't think it is a sign of forgery either (although it could be an indication of that in other cases). 

I believe it is the result of a type of chemical cleaning where the light green is the only remains of the original patina.

SC