PH Testing Pen – Lineco$20.00 The pH testing pen provides a quick and easy method for testing the acidity of paper. Simply draw a line and watch the colour as it dries. The chlorophenol red will turn purple/lavender as it dries if the paper is acid-free or neutral pH, while yellow or colourless indicates acidity. PH Testing Pen - Lineco quantity Add to cart Related products Tweezers #3CB $18.00 Details Umeda Mitsumata 25gsm $45.00 Details Solvent Dispensers $55.00 Details Gift Voucher Pigma Pens
