It could of been in the sun, it could be soaked in warm water ,it could be soaked with lighter fluid ,Unless a catalog has a statement to color, figure it was done by outside means .
For the benefit of those who don't have an SG close at hand, the base 128 is dull purple; 128a is chalk-surfaced paper (128aw is watermark inverted CSP - big premium); and 128b is plum (issued Feb. 1908).
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