by pi3rce42 on Sun Feb 17, 2008 3:40 pm
Kraft paper is usually pretty acidic. I've got a PH pen I use on left over mat and foam board, cuz I tend to forget if its acidfree/archival or just 4ply mat. Smaller handbills that I am framing dont' necessarily require acidfree as much as prints, but why not take care of the better ones anyways?
Anyhow, long story short, you use the pen on a corner or obscure piece of mat or paper to give you a rough estimate on how acidic it is (if its clear to yellow, its acidic - <6.8pH, if its purple >6.8pH its acidfree).
When used on kraft paper, it turns clear almost immediately.
don't sweat the petty things, and don't pet the sweaty things...