Toning on coins

Hi, still new to coins and I know none of these halfpennies are valuable, just curious to know how the turqoise toning on it would affect its value

It hurts the value a great deal. Even in pristine condition these coins don't have much value and with the eye appeal essentially lost due to the toning or whatever that is, makes them undesirable to collectors of this type. Much of what you have there is probably not toning but what is the start of what is described as Bronze disease. I cant say for certain but that is what it looks like to my eye.  Essentially coin cancer to Bronze coins. Sorry.

I've seen US Indian Head Cents go for well over the price of a non-toned coins with this type of toning. But the only way to tell the true value, would be to list one or two on ebay.

The last Indian head cents were made in 1909. These are are 1965. How you  compare  2 entirely different coin types with a 56 year difference in attrition rate and circulation is beyond me.

Have to agree with Harry. If is is natural toning it's ugly.

I haven't seen anything quite so widespread before but based on the colour, I would suggest it is not toning but verdigris corrosion, caused by the coins having been in a moist or humid environment in the presence of air.

radrick007

I haven't seen anything quite so widespread before but based on the colour, I would suggest it is not toning but verdigris corrosion, caused by the coins having been in a moist or humid environment in the presence of air.

Exactly.  That looks like Verdigris.  I've heard it referred to as several different terms here in the U.S.  This falls under the category of environmental damage according to TPG's (Third Party Grading Companies):

PCGS:  "Another environmentally-caused illness is verdigris. It is a metallic corrosion (usually on copper and bronze coins) and often appears as a powdery green growth. It can be progressive, and is quite a serious problem. In fact, it is sometimes referred to as "coin cancer." It can even spread if an infected coin comes into contact with other coins, and therefore should be avoided by all collectors."
Source URL:  https://www.pcgs.com/news/no-grade-coins-pt6

I believe I pointed out the “Bronze Disease” in my first post. 

harryg

I believe I pointed out the “Bronze Disease” in my first post. 

Yep!  You're absolutely right.   Sorry for missing that.

Here are some clearer pictures, some of them have rainbow toning