1913 Canada Large 1 cent only 5.2 gram Under weighted Coin

[Vancouver007]

Hi CAC Members,

Can somebody help me to identify error of this 1913 Canadian large 1 cent with under weight of 5.2 gram, D 25.4mm, T 1.4mm, heavy raised lamination lines and some shallow design marks under the lamination lines in the field.
Its normal weight suppose to be 5.67 gram, so this coin is under weighted by 0.47 gram. Its Cool find,

Thank you,

[coinguy]

Have seen a few of these lately.
It has been attacked by acid which has eaten away the surface
and rims accounting for the lighter weight.
You will probably find the diameter is slightly smaller also.

[Vancouver007]

Ah, I see, Thank you,

[Vancouver007]

Hi coinguy,

I just couldn't understand why people would put the coins into harsh acid to purposely damaging the coins.
So I googled and this is what it said;

"Coins are sometimes put in acid to clean and restore their appearance. The acid dissolves oxidation (like tarnish) and other surface deposits, leaving the coin looking shiny and clear. However, this process also removes a small amount of metal, which can lower the coin's grade and appeal for collectors".

Thank you, you solved my ever lasting mystery, thank you,