What cleaning strategy to apply?

[Numerianus]

Could you, please, give me an advice how to clean this sestertius.
Or it is better not to touch this ugly concretions?

[Johnny]

I would try  very light pressure  with the side of a pinvise  ..pressure should be applied to the edge of the dirt.  I have seen this dirt  before  and it should flake off when pressure is applied.........**** use only  the side of the pin ,  the point of the pin vise will break throught the dirt  and patina  and wreck it

NOTE...this is only  my opinion,  as I do not want to be help responsible for damaging such a nice coin   

let me know if you try it and how it turns out

cheers

[Mayadigger]

Ave!

I would try  very light pressure  with the side of a pinvise  ..pressure should be applied to the edge of the dirt.  I have seen this dirt  before  and it should flake off when pressure is applied.........**** use only  the side of the pin ,  the point of the pin vise will break throught the dirt  and patina  and wreck it

NOTE...this is only  my opinion,  as I do not want to be help responsible for damaging such a nice coin

let me know if you try it and how it turns out

cheers

Excellent advise, Johnny!

If this technique fails, a soak the coin in DW and then gently remove the hard dirt with a common dental pick.

Kevin