Suerly though all coins that are not full lustre have toned, so how do you determine what is acceptable environmental damage and what isn't? We are all familiar with how our collected coins normally tone, and what types of colour range are to be expected....and at the other end of the scale we can all spot those "rainbow toned" uglies!! The middle ground however is not so clear, I have seen many farthings that have toned as a result of being in flips, and whilst 99% of them are uneven, or even damaged by this environment, the odd occasion results in a very attractive coin. This coin recently came from part of a collection in flips, you can see where the PVC window has sat, but has given the coin stunning eye appeal. Even the photo does not do it justice, it really is a beauty.   Therefore is it only intentional toning that is unacceptable? Discuss