Patina change in the case box...

[tomclark]

Most Florida dug points, when they come out of the ground, have a lot more color......they start changing as soon as they come out of the ground. The first pic of that point it was wet, but still was somewhat shiny when it dried. It was put into a casebox and into a drawer for years, was never really out in the light. The other side was similarly affected. Water often immediately brings out some color but the mineral oil really brings it out. Light mineral oil soak on non chalky material. Can take it back out with acetone bath anytime. Even oiled and left out, the material will still become hazy it never completely stays clear. Some bigshot collectors lol here have backlit case boxes with oil in them! Try the mineral oil on some chips of different material. Here, white patina can be "covering" almost any color, clear and vibrant. Especially coral and high grade chert/agate.

[Tam]

You good idea to try chips first .
perfect !!!!!
I was thinking their own body oils would be on them .

[Havenhunter]

Organics, attached to rocks underwater & buried in soil or sand, create interesting & often lovely patination. Once exposed, they slowly die, changing the hue. Pollutinates in our air, sunlight UV, & out-gassing from the foam in our cases all contribute.