In my opinion the best quality chips ever made were made by USPC during the 1911 to mid 1940s when the Burt Company took over chip production (there may have been a cross over period where both companies made chips for a couple of years)

During the 1911-1940s period an inlay was made of a very thin piece of white celluloid (celluous nitrate) on which the graphic was printed. On top of the inlay was placed a much thicker clear celluloid inlay which protected the graphic.

When Burt made chips they used the same process as USPC but used plastic instead of celluloid for its inlay. Celluloid (what movie films were made of) was extremely flammable. Smoke produced from a celluloid fire was extremely toxic.

I have never found celluloid inlays to shrink. Such inlays yellow over time. Burt inlays did not yellow.

Thee only chips I’ve seen where the inlays lifted where the pre 1911 chips where instead of a thin layer of celluloid, the graphic was printed on paper then covered with celluloid.