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If the tea leaf mixture is very fine, layer two pieces of cheesecloth on top of each other

3B) reveals not only striking spatial contrasts in cigarette butt contamination levels but also important regional trends and data imbalances

Observational health data sciences and informatics (OHDSI): opportunities for observational researchers

"When you're going through Oriental tobacco, you'll see these little pin holes at the back end of each leaf a lot of times, or places where that was ripped out, so it's apparent that the leaf was sewn together into a ring that could be hung on an A-frame and set on a reflective surface