Sometimes Humidity Card is also said as desiccant. Humidity indicating card as spotted layer of cobalt chloride solution. When it reacts with moist air it changes its color from blue to magenta- red to pink. This indicates different level of moisture content in environment. Although, these cards are not made to precisely indicate the percentage of moisture in air but it is very good in informing the maximum possible moisture content. For example if all the dots on the card are dark blue in color then it can be assured that the moisture level is below 10%. To know the moisture content of the environment is very important because as long as the humidity level is below 40% there are very less chances that basic corrosion activities will happen.
Some applications where the involvement of humidity indicating cards
is important are in the storage of semiconductor and electronic items.
As moisture is the biggest enemy of electronic items it is very
important that the place where the electronic device has to be kept
should be free from moisture. Also, it is like a blessing to the food
and packaging industry as know very well that moisture enhances the
microbial activities. Pharmaceutical industry is also another place
where it is used in huge quantity. As a result it is produced by many
desiccant industries in bulk.
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