pH Testing Pen liquitex-marqueurs accordion-style base can be unfolded

accordion-style base can be unfolded for desk use

it's up to you to bring them to life with paint or coloured pencils

The 46 detailed scenes welcome you into the great outdoors with dazzling designs filled with a wonderful variety of flora and fauna

Burnt Sienna

They clean up well with water while wet

pH Testing Pen liquitex-marqueurs accordion-style base can be unfoldedThe Lineco pH Testing Pen is an easy, convenient method for testing pH levels in paper and cardboard. Simply draw a line and instantly determine the answer. The red chlorophenol indicator solution turns a definite purple colour on any paper with a pH of 6. 5 or higher. Any other colour would indicate a material most likely unsuitable for conservation purposes.