I don't know what BAM tests are and I don't know any of the details of the British Library tests. But the testing of Chicago's 'Archaic Mark' showed a cardon-14 date of the vellum as 14th century - but visual examination showed that the original writing had all been scraped away and other tests showed that the 'Archaic Mark' writing had been done with 19th century inks. So a carbon-14 test of the Sinaiticus would (by destroying some piece of a page) show the vellum was made in the 4th century but wouldn't, by itself, verify the date of the writing.
The British Library clearly spends a lot of time studying the Sinaiticus and has experts - and access to more experts - in topics that verify the antiquity of the Codex. Librarian to librarian, I trust them for their evaluation of the date of Sinaiticus and I am resistant to suggestions that the British Library has neglected the proper tests. I accept the broad consensus of the 4th century date of the Codex.
The British Library clearly spends a lot of time studying the Sinaiticus and has experts - and access to more experts - in topics that verify the antiquity of the Codex. Librarian to librarian, I trust them for their evaluation of the date of Sinaiticus and I am resistant to suggestions that the British Library has neglected the proper tests. I accept the broad consensus of the 4th century date of the Codex.
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