Acid Tester ?

[fostrmom2mny]

An aquaintence of mine told me that she has a pen that tests for acid. I have been looking around and have not been able to find one. I have found some really cute, fun Disney sticker books at Wal Mart for $2.00, but without knowing whether they would pass the acid test, I'm afraid to purchase them. Any idea where to find one of these pens?
Gerri

 

[bobcat]

I have a couple of these. I think I bought one at Walmart and the other at JoAnne fabrics. Hope this helps!