An interesting kennedy half holder

mbbiker

I don't know if this is the one that causes toning or not but it looks like a neat historic holder
link

Russ

This is the one that causes toning:



Although, my guess is that if you left the coins in the holder in that auction long enough, it would probably also cause some toning.

Russ, NCNE

mbbiker

how about this holder?
link

gmarguli

mbbiker, I've seen a lot of those and they don't promote toning. A lot of times the plastic is sealed and that probably stops the toning.

The on Russ posted, as well as one with a similar text, promote toning.