White to grey, other cards
For comparison sake:
ROUGH RATIOS (I didn't do the same precise math as for Mantle):
Mantle: 14 to 1, grey more than white
Clemente: 3 to 1, white more than grey
Robinson: 3 to 1, white more than grey
Williams: 3 to 1, white more than grey
Koufax: 4 to 1, white more than grey
The other outlier, like Mantle:
Mays: 14 to 1, grey more than white. The greys in higher grade - PSA 6+ - are 42 to 1, grey more than white
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