Aizome makes beautiful sheets dyed with natural indigo. The dye is applied using a centuries-old Japanese dyeing technique.
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Pet dander is not the hair or fur of the animal, but is old skin scales which are constantly shed. Animal dander is extremely light weight and tiny in size (approximately 2.5 microns). It can stay airborne for hours.
Pets tend to shed a lot of dander, so you want a machine with a good pre-filter to stop pet hair reaching the main HEPA filter.