Friday November 22, 2013
![](https://www.aiweirdness.com/content/images/public/images/35d4f5ae-7ecb-424a-b2b9-8b0c72dadc7f_645x516.jpg)
Frostlike patterns emerge when acetone partially dissolves a plasticy layer of old photoresist. This is the same sample as in my previous post, which used to be covered in jagged black mountains made of plasma-damaged photoresist. Now the mountains are mostly dissolved away, except for a few jagged peaks still visible in the upper left. Even though the photoresist wasn’t completely gone, I learned what I wanted to from this sample: that the photoresist had successfully protected the underlying semiconductor material from the etching plasma.
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