The Lineco Ph Testing Pen is an easy, convenient method for distinguishing between safe alkaline paper and board, and unsafe acidic paper and board. Easy to use, simply draw a line and instantly determine the answer.
The chlorophenol red indicator solution turns a definite purple color on any paper with a pH of 6.5 or higher. Any other color would indicate a material most likely unsuitable for conservation purposes.
UPC: 099295530811