The record
A 1958 Battelle Memorial Institute analysis for J&J identified fibrous tremolite in the talc supply, per the test inventory in Table 3 of a peer-reviewed review of J&J's internal talc testing (PMID 33641519).
Claim scope
That J&J commissioned an outside laboratory analysis of its talc in 1958 and that the laboratory reported fibrous tremolite.
What this source does not establish
The review's table does not provide the 1958 report itself, its concentration figures, or the phrase 'less than 1% to about 3% acicular tremolite' — that description traces to Reuters reporting, not to a retrievable primary document. Do not cite Chapman v. Avon for J&J knowledge; that opinion concerns Avon's testing.
Limitations
Present as the earliest dated external-lab detection in the J&J testing record. Do not repeat the Reuters concentration language as fact; note the underlying Battelle report has not been produced publicly.
Source
Pmid — 33641519