Frostlike patterns emerge when acetone partially dissolves a plasticy layer of
old photoresist. This is the same sample as in my previous post
[http://tmblr.co/ZP7VLs_nDmsM], which used to be covered in jagged black
mountains made of plasma-damaged photoresist. Now the mountains are mostly
dissolved away, except for
![(Untitled)](/content/images/size/w795/926700eef45bc172076c1653cce1b677/tumblr_mwocshe35S1spzrmao1_1280.jpg)