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Several times on this board i have made the claim that "all black powder substitutes except for Black Horn 209 contain potassium perchlorate. " The NIST laboratory has confirmed that BH 209 does contain potassium perchlorate.
Sorry.
Link from a poster on another site:
https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=926574
Sorry.
Link from a poster on another site:
https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=926574