Copper, starch and iodide moisture indicator
View Patent ↗The invention relates to a moisture indicator which includes iodide, copper, and starch.
1. A humidity indicator comprising:
a water vapor permeable container; and
iodide disposed in the water vapor permeable container;
copper disposed in the water vapor permeable container; and
starch disposed in the water vapor permeable container.
2. The humidity indicator of claim 1 , wherein the water vapor permeable container comprises a capsule.
3. The humidity indicator of claim 1 , wherein the water vapor permeable container comprises a transparent section for viewing the contents of the water vapor permeable container.
4. The humidity indicator of claim 3 , wherein the starch comprises amylose starch.
5. The humidity indicator of claim 1 , wherein the water vapor permeable container is impermeable to liquid water.
6. The humidity indicator of claim 1 , further comprising a carrier material.
7. The humidity indicator of claim 6 , wherein the carrier material comprises a hydrophilic material.
8. The humidity indicator of claim 6 , wherein the carrier material comprises at least one of cellulose fiber, methyl cellulose superabsorbents, or silica gel.
9. The humidity indicator of claim 1 , wherein the contents of the water vapor permeable container change color at between about 20% and about 25% relative humidity.