lakmoepapier
Lakmoepapier, often translated as litmus paper, is a water-soluble paper used to test for acidity. It is dyed with a mixture of natural dyes from lichens, most famously Roccella tinctoria. When exposed to an acidic substance, lakmoepapier turns red. When exposed to a basic or alkaline substance, it turns blue. In neutral solutions, it remains its original purplish color.
The mechanism behind this color change relies on the presence of specific chemical compounds within the lichen
Lakmoepapier is a common and simple tool for qualitative pH testing. It is widely used in educational