Thoughts on these Napki Malka coins

[Desibot]

Hi
Would like everyones opinion on these coins
Thanks

[Manzikert]

They look OK to me: all different dies, different metal compositions, etc.

Alan

[Figleaf]

While they could be left as they are, you may want to consider washing them (except the upper left coin, which has a great sand patina and should be left as is) in lukewarm soapy water, rubbing them lightly with your thumb. Neutralise with clear water and dry well. Close off from pollution and oxygen with renaissance wax or another museum-quality product.

Peter

[Desibot]

Thanks for advice i will look into it
I was thinking of having them cng certified but if any one knows alternative in u.k please let me know