Preserving Coins

I have been looking for an ultrasonic vacuum sealer but did not find any ; probably because I do not know the Flemish name for it

Is that the kind of ultrasonic heatsealer you used ? and how do you get the vacuum on the bag , with a pumping device ?

If it is vacuum sealed I probably will not live long enough to see any changes on the coin posted

Hi all, being a electrical engineer and worked in the food industry for some years has taught me one thing and that is if oxygen comes into contact with any man made or natural material it will oxidise, causing either discolouration on paper, or copper sulphate ( which is the green on the copper and copper composite materials eg. Brass ) so by causing a vacuum in a non porous vessel one would eliminate, or keep under control the corrosion factor, in saying that one should use a non porous substance, some plastics are biodegradable and would become porous, given time.

So what I would suggest, is using the vacuum machine but not using biodegradable plastics! Another tip would be to coat the items in some non corrosive oil to further their longevity before sealing them.

I hope this will be of use to to all.

Cheers

My red wine does not need stopping

Cheers