Melting Non US Coins?

it's usually illegal in the country of origin of the coin. Outside of that coin's country, probably no way of implementing the ban.

besides, it's difficult melting down various coins based on color as each would have different melt temperatures as well as the metallurgy of the melt would be difficult to manage

I saw a thing on you tube about melting pennies with a magnifying glass and it looked pretty cool so I wanted to give it a try without using any US coins. I know I could use a torch but I would prefer not too due to safety reasons plus want to see what mother nature is capable of plus some of the videos I don't think are very accurate as I doubt it could melt a stake of penny's in A minute

Don't know how old you are but please be carefull of what you see on places like Utube or actually any web site. Always stop and think. Note carefully that some of the people that post things are nuts, insane, wierd or just don't care. Remember that if you try something you saw on the internet, those that posted it will NOT come to the hospital to even visit you. Nor will they help pay for your hospital bills.
If someone melted a coin with a Magnifying glass from Sunlight, could have been a plastic coin, a different Sun than ours, on a different planet or the magnifying glass was the size of the Mount Palomar Telescope.
First thing would be to try to find out the value of those coins and/or if someone would want them.