M&Ms are made by coating small round bits of chocolate with a candy shell so that, yes, it melts in your mouth, not in your hands (mostly). The "m" is printed after the candy coating has hardened and (I think) been glazed.
To remove the signature letter, take a small cup or bowl and fill it with an inch or two of water and drop in a few candies. In my experience you won't be able to harvest the letter from each one, so plan accordingly.
As you can see above, it first appears that the letter is dissolving, but don't lose hope. Because within a few minutes you will see the pigments from the candy shell sink to the bottom and a bit of detritus float to the top. Search the floating matter for an "m" and get ready to celebrate if you find one.
This photo is a bit better. It was challenging to get my point-and-shoot camera to focus on the small, faint letter. You're not going to be able to make fake M&Ms with it, but it's a fun party trick or bar bet.
This is what was left behind in the cup. I suppose they are edible, having only been submerged in water for a few minutes, but we didn't eat them.
What would happen if you submerged the candies in vodka or rubbing alcohol? Hmmm. I don't know, but if you try it, be sure to share your results!
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