Marti Classical Numismatics and patinas

I have purchased a number of coins from Marti and have never been disappointed. I find them to be a very reliable company. It is true that often one can identify the company by the photos. I am not a good photographer, so I couldn't offer an explanation, but if you look at a number of coin companies, one can observe this phenomenon. I imagine it is their technique. Anyway , I would recommend Marti.

 

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Here's another VCoins dealer whose coins all seem to have the same, light, sandy patina. Notice in particular the Gordian III antoninianus. I've never seen an antoninianus with a patina like this before:

https://www.vcoins.com/en/stores/numismatica_prados-241/ancient-coins/Default.aspx?#!/Home