Need some help with a coin again!

[DiggingAtMaxSpeed]

Hi! My lucky husband has found another coin on the same old fields we have been going to for awhile! This one I have identified, its a Canadian One Cent, from the parts of it I can see. (and comparing to the attached picture). What I wanted to see is if anyone knows any tips on how to get the hard scale off so I can see the year. I’ve tried a toothbrush and a toothpick but it’s pretty tough. Any thoughts? It’s between 1876 and 1901 and I want to try to see exact year where the lighter colored scale is.
Thanks,
Kelly

 

[John-Edmonton]

That oxide can be a challenge. DON'T put it in an ultrasonic machine, as it will remove the oxide and leave a crater. Try soaking it in some hydrogen peroxide (over the counter stuff) at full strength. After 24 hours, some of that nasty stuff will be removed.

 

[Coin Rescue Inc]

On Lincoln cents with mineral deposits I heat up the Hydrogen Peroxide in a microwave close to boiling point

That speeds up the reaction