Oooops, Think I Just Way Over Paid For Group Of Greek Uncle'

I see a ptolemaic Eagle. Greeks do cost £2 each - I've only ever had 10 uncleaned and thats how much they costed me. Mine actually cleaned up surprisingly well - you might have some good stuff under that.

Yep, I most certainly do. First off, quarantine and clean out the vessels they were in or get new ones.

Second, put away the lemon juice, that will only speed it up - bronze disease is, at its heart, an acidic process, caused by Hydrochloric acid formed by Chloride ions on the coin's surface reacting with water (its a bit more complex than that, but this explanation is sufficient to undertsnad whats happening).

Third, remove all the green. Dont hesitate to remove patina, just go at it. Dig down to bare metal. There can be no hint of it left. and make sure the patina isn't undermined - if it is, just keep going until theres no green left.

Fourth, begin distilled water treatments. This ebbs out the chloride ions which propagate and cause BD. Its slow and more green will develop even during treatment - remove it all. I soak the coins for a few days, then remove green, replace the water, rinse everything and repeat. It can take a long time to fix the problem.

Once theres no sign of anything green for a couple of weeks, move the coin to its own distilled water bath and continue the treatment for 2 more weeks, just to be thorough. After that, bake it in the oven to remove moisture and seal in wax - if moisture cant reach the coin, then the few remainig chloride ions wont be able to continue.

It will take patience to fix it, but these things have weathered 2000 years already and theres no reason they cant survive the next 2000.

Thanks VM, I will get to work on them, I should have asked first as I think I have made the problem quite a bit worse.

fingers crossed.
One thing I find amazing, Is how many roman coins survived 2000 years, yet, I see a lot of Victorian dug coins that look nothing but a flat piece of metal.