Cleaning that rainbow colored film off of a bottle

[BARQS19]

Does anyone know how to get that thin film of ( looks like mica the mineral, not sure I spelled that right) off of a bottle? It has a rainbow color to it & it's usually on dug bottles.
Robert

 

[Harry Pristis]

Hello, Robert . . .

It is not a "film." It is, unhappily, the glass decomposing in thin sheets.

Check out this earlier thread for more info:
https://www.antique-bottles.net/forum/m_6609/mpage_1/key_st.,augustine,sheen/anchor/tm.htm#6626

--------------Harry Pristis

 

[diggerjeff]

sometimes putting the bottle in a very sunny window will help some of it flake off. but it will never look like new unless it is tumbled. rub a little mineral oil in to the surface, it will help the appearence for a while. this is something you will have to do from time to time to keep it looking good.