Everyone may have a different interpretation, but to me "toning" is an even change of color on the entire ball. Very few, if any baseballs, stay snow white... they all tone to some degree due to the aging of the organic material and the various chemicals in it.
Spotting is when there are distinct dark spots or stains. I think most collectors would avoid a ball with unappealing stains... especially of they are near the signature.
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