Me Too on the 2.5 x 2.5 cardboard/mylar flips in 12 pocket pages.

Here is a scan showing several soft 2x2 flips and the reason you should never store a chip in them for more than a few days.
Note that green will also transfer... I don't know how long the chips were in these holders, they are from a large collection I bought and am hurriedly getting into 2.5x2.5 cardboard.
Also, a pic of a chip after storage in one of these 2x2's. The "paper"(?) inlay stuck to the holder, which did more damage to it than leaving it out in the open would have done.