Litmus paper in a paper box (blue) 500 sheets 07020100 1 box (500 sheets)

It is widely used to determine acidity; when it comes into contact with an acidic solution, the blue filter paper turns red. Blue is for detecting acid, and turns red when one drop of pH 5.0 buffer solution is dropped on it. Sensitivity: turns red when one drop of pH 5.0 buffer solution is dropped on it. Size (mm): 10 x 60 Quantity: 1 box (50 sheets) x 10 boxes