Many of the Canadian dollars have outstanding colorful toning that comes naturally from the materials used by the RCM
for commemorative boxes and the "fancy" specimen/proof set holders (i.e. non-poly.)
However, this also makes white examples good candidates for artificial toning. Done properly, it is indistinguishable from natural toning, by the average collector or by a TPG
. Otherwise, it is more easily detected as "artificial" toning due to patterns, colors, etc.
Two of my Canadian dollars, the first is in its original packaging (not a TPG
), the second was already "slabbed" when purchased.
Another raw example from my collection, this 1966 Irish 10 shilling obtained its colors from its storage box, much like the BC dollar above.
Of course, even being in the OGP is no guarantee that a coin hasn't been artificially "enhanced". However, over a lifetime of collecting, you get a feel for certain issues that are known to tone spectacularly because of quirks of their boxes/holders, and the Canadian commemorative and specimen dollars are one such example.