changes color
It changes color.
It changes color
it changes color
It changes color.
m9 paper
It changes color. AND It is any form of red
it changes color
M9 paper
M9 Paper
It will change colours. Yellow to brown for G (nerve) agents, red to purple for H (blister) agents, and green to black for V (nerve) agents.
M9 paper
The material you are referring to is likely a chemical agent detection paper called M8 paper. It is olive drab and treated with chemicals that change color when in contact with certain chemical warfare agents, aiding in their detection.