It's that time of year again when we start seeing a lot of moldy textiles around Museum Textiles Services. Mold spores are everywhere, all of the time, but it takes specific conditions for mold to bloom and become a problem. In 90% relative humidity and 90°F, it only takes three days for mold spores to flourish and bloom. As the humidity and temperature decrease, the time it takes for mold to bloom increases, so at 80% relative humidity and 80°F, it takes three weeks. At 70% relative humidity and 70°F, it may take up to three months for a mold problem to become apparent.
For moldy modern clothing and textiles that are in good condition, you can take them to a dry cleaners for their professional opinion.