MS 70 turned my 1955 Yugoslavia coin insane

This is what it says on Amazon:

safe to use on gold, silver, nickel, copper, brass and bronze
will not change the color of your coin

Well it has been said here that it will turn copper coins blue.

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Well, the coin IS bronze, I just didnt realize that the bottle meant 100% bronze coins

 

Yes. Only use solvents like Acetone, Isopropyl alcohol or Dichloromethane.

 

To help speed up the cleaning with Acetone, you can soak a Q-tip in Acetone, then ROLL it over the surface of the coin. Don't rub, unless it is a circulated coin, and then, don't use any pressure.

 

Aluminium (oops, wrong English), Aluminum-Bronze is a different animal, using Aluminum in place of Tin.

 

99% aluminum.according to catalog, not confirmed, but likely.

 

ETHANOL, 2-BUTOXY PEL: 25 PPM
CAS #: 111-76-2 TLV: 25 PPM
POTASSIUM HYDROXIDE, LIQUID PEL: NOT ESTABLISHED
CAS #: 1310-58-3 TLV: NOT ESTABLISHED
SODIUM GLUCONATE PEL: NOT ESTABLISHED
CAS #: 527-07-1 TLV: NOT ESTABLISHED
SULFONATED SODIUM SALTS PEL: NOT ESTABLISHED
CAS #: 147732-60-3 TLV: NOT ESTABLISHED
INERT MATERIAL PEL: NOT ESTABLISHED
CAS #: 7732-18-5 TLV: NOT ESTABLISHED

https://www.google.com/url?sa=t&rct...530.MSDS.pdf&usg=AOvVaw0kEKpPrINEGdk02Kl0hcxI

 

Not dichloromethane (methylene chloride) or other halogenated solvents, please. There are warnings against using it on alloys of aluminum, magnesium or zinc.

Same thing with Koinsolv, which contains on n-propyl bromide.

It might not attack any given aluminum coin, but I wouldn't trust it.

 

And the "acid free" part is scientifically accurate. The potassium hydroxide makes it a strong base. Problem is, aluminum and zinc are attacked by strong bases just as quickly as by acids.

I got my nose rubbed in this because I started running aluminum baking pans through the dishwasher. Dishwasher detergent (these days) is mostly sodium carbonate, a strong base. The pans developed pits, and one actually developed pinholes.