The chlorophenol red indicator solution in the pen will turn purple on any paper with a pH of 6.8 and above. Turns purple on paper with pH 6.8 and above.
Lineco 901-1008 Neutral PH Adhesive 8 Ounces - Packaging May Vary
Lineco Self Adhesive Cloth Tape 32mm x 10m Archival pH Neutral White Hinging
Lineco Self Adhesive Cloth Tape 25mm x 10m Archival pH Neutral White Hinging
Baume Hydrometer Glass 250mm 0-70 Degree For Ferric Chloride Solution Testing
Hand Press Sample Circular Cut Testing Equipment Easy Operation
Gold silver platinum precious metal testing touchstone scratch touch stone 3 x 2
