wash in mesh bag, also lay them out to dry on any surface. There is one way to test the material, keep in mind it will only tell you if it is man made or natural.
take a sample piece of each fabric (a corner) and hold a lighter to it. Man made melts and natural burns and makes ash. Remember that man made material bleaches out over time when exposed to light.
take a sample piece of each fabric (a corner) and hold a lighter to it. Man made melts and natural burns and makes ash. Remember that man made material bleaches out over time when exposed to light.