Reply To: Acid Test Pen, Folder test question


I have been using acid testing pens for many years now and have seen the results go from  purple immediately to not even visible because  the paper is so acidic, and others where the purple slowly fades to yellow and then brand new right out of the wrapper stays bright purple.  As someone on this thread stated, it depends on the acidity of the paper, is is truly neutral, is it buffered, or is your own skin contact increasing the acidity.

Final comment, I saw no mention of lignen testing pens.  I have a lone, should I not believe the reults?