| Illustrator pH testing pen | With a simple swipe of the pH testing pen, you can determine whether the paper and board you are using is acidic.
This easy, convenient method allows you to distinguish the difference between safe (neutral or alkaline) paper and board & acidic materials.
Easy to use; simply draw a small line on the material you wish to test. The Chlorophenol red indicator solution in the pen will turn purple on any paper with a pH of 6.8 and above. A clear or yellow colour indicates the material is probably unsuitable for conservation purposes. | | $3.95 | |
