Researchers analyzed over 100 period products for fluorinated compounds, an indicator of potentially harmful per- and polyfluoroalkyl substances, or PFAS.
DYEING, PRINTING & FINISHING: PFAS – A Textile Perspective
PFAS: Some period products may contain 'forever chemicals
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EPA: PFAS forever chemicals found in drinking water systems for 70M
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70 analyte PFAS test method highlights need for expanded testing of PFAS in drinking water - ScienceDirect
Thinx Again: On the Problem with PFAS in Our Period Products - Aviva Romm, MD
PFAS Forever Chemicals in Sanitary Pads & Incontinence Pads
An improved ink for colon tattoos
Indicator of PFAS found in some — but not all — period products - Inside Water
PFAS Sources - Enviro Wiki
Keeping PFAS Forever Chemicals out of Building Products