Find out. The National Institute of Standards and Technology will provide you a two-gram sample of Standard Reference urban dust for $761.00. Or, if your bed is in a more pastoral setting, you can pick up twenty grams of medium test dust for a mere $500.00.
The NIST can, in fact, furnish reference samples of just about anything, from argillaceous limestone (70 grams @ $989.00) to peanut butter (a whopping 510 grams @ $881.00) and beyond (way beyond).
Never again just guess.
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