Well, this one is at least sort of new insofar as I don't think you explicitly posted it before. But it again is from that book by Bill Cooper you keep pointing to, and links to the critique of it have been posted, though
here it is again for convenience. Here is the a portion of it that responds to the specific claims made:
"Even more unfortunately, Dr Cooper calls the wrong witnesses to the condition of the Leipzig leaves. He cites Uspensky as a witness, for he says (p.78) that the Leipzig parchment ‘was described by [Uspensky] as “white” (“...the thinnest white parchment”)’; (p.82) ‘the Leipzig leaves were so pristine when first seen by Uspensky’; (p.86) ‘the Leipzig leaves...[were] “white” according to Uspensky’. But Uspensky never visited Leipzig all his life, and he arrived at St Catherine’s in 1845 some months after the 43 ‘Leipzig leaves’ had been carried away by Tischendorf. As we have seen, Uspensky was not describing the ‘Leipzig leaves’ but the leaves remaining at St Catherine’s monastery in 1845.
Dr Cooper also cites James Alexander M’Clymont as a witness of the ‘Leipzig leaves’, whom he says ‘came a little later when in 1913 they were still white as snow’: this ‘witness testifies in 1913 that it – the Codex [Friderico-Augustinus] – “is written on snow-white vellum.”’ (p.78). But M’Clymont was writing secondary literature and not claiming to be testifying as an observer. Moreover, he was not even commenting on the Leipzig leaves, which the reader could have seen for himself had not Dr Cooper pared away the author’s context: ‘Codex Sinaiticus...was rescued from oblivion nearly fifty years ago246...and now lies in the Library of St. Petersburg. It is written on snow-white vellum, supposed to have been made from the skins of antelopes.’ Similar reservations attach to a third claimed ‘contemporary observer’, Ernst von Dobschutz, who in an encyclopaedia article published in 1909 stated in extremely similar wording to M’Clymont that ‘The wonderfully fine snow-white parchment of the Sinaitic MS seems to be of antelope skin.’ Tischendorf had proposed that the parchment was made of antelope or gazelle skin, but microscopic examination has shown that the parchment is mostly calf with some sheepskin, neither of which is naturally ‘snow white’. M’Clymont and Dobschutz were simply repeating Tischendorf’s opinions in their secondary and tertiary literature. Dr Cooper provides no evidence that Dobschutz was referring to the Leipzig leaves, nor that he had ever himself seen them.
Accordingly, Dr Cooper is left with not a single genuine witness who even saw the Leipzig leaves in the nineteenth century, never mind one who described its apparent colour as ‘white’ or having an appearance inconsistent with being produced in antiquity. He wrongly quotes sources who certainly did not see the Leipzig leaves, but quotes none of the scores of people who certainly did. And yet Dr Cooper (whom, we recall, is not himself a witness) assures his readers that the Leipzig leaves in the nineteenth century had ‘astonishing whiteness’ (p.79) and had the appearance of being ‘of relatively recent manufacture’ (p.79) as they were ‘so clean and new and undecayed in their appearance’ (p.78).247 This is all the pure invention of the conspiracy theorists and entirely contrary to the facts."
(footnotes can be viewed in the document. This quotation is from pages 109-110)
I'll cut it off there for brevity, but it does go on to talk about people who
did personally see the leaves back in the 19th century, then goes into a deeper analysis of what I noted in my last post concerning the color balancing issue.