Artificially Toned Vs. Naturally Toned Vs. Intentionally Toned

Because pristine silver coins can be artificially tone to be very attractive, I do not ascribe any extra value to those coins.

Because it can sometimes be very difficult to tell the difference between artificially and naturally toned coins, I do not ascribe any extra value to those, either.

What you may find however, if you are very lucky, are 100 year old blast white silver coins in MS++ condition, just as if they had just left the minting press.
Such coins would be very rare, and thus should attract a higher value, well above their toned equivalents.

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To proceed to artificially tone freshly minted ASE's, and on sell them to those who like rainbow toned coins perhaps OK, but those buyers must preserve them in airtights, or they will be disappointed in future years.