... humidity indicator label 1,Lead-free ROHs compliant 2,change color from blue to pink 3,quick delivery in 24hours ... moisture-sensitive chemical is impregnated such that it will change color when the indicated relative humidity is exceeded. This item ... Features of humidity indicator labels1), Lead-free ROHs compliant2), reversible color change,3), quick delivery within 24 hours4) , OEM allowed5), cocl2, ...