What is the relative humidity range for silk?

I'll be purchasing a dry cabinet to store an item made of silk in order to prevent the growth of mildew. So what's the best level of humidity? Thank you.|||I once read that humidifier producers recommend not to have more than 45 percent relative humidity in your home to avoid fungus and bacterial growth. I haven't read anything special about silk but I would think that 45 percent is a good value.


Just a precision when it comes to relative humidity: The absolute humidity is the volume of water per volume of air. That doesn't vary as long as the air outside is not replaced by e.g. a moving in low pressure. The relative humidity is the percentage of humidity to obtain full saturation, that varies with the temperature; the higher it is, the more moisture the air can contain.





In the winter, when it is cold outside, the relative humidity may be 100 percent but when that air gets in your home and is warmed up, the relative humidity drops a lot. For example - and excuse me to use metric values but what's what I am used to - a cubic meter of air at 0 C can't have more than 5 grams of water. But at 15 C, it is up to 13 grams. If a cubic meter of saturated air at 0 C enters your home and is heated to 15 C, then the relative humidity will drop by 5 / 13 * 100 = 38 percent and that is dry air.