Sure thing Umut,

Here are two excerpts from American Photo, Volume 34 (circa 1947 I believe). I can email anyone the complete series from this volume (inquire through PM please), but I'm only including the two relevant pages here. The second attachment, page 362, includes Friedman's plea for discovering suitable pinatype dyes.

Also, just noticed this reference,

"L. Lemaire (British Journal of Photography, Vol. 58 (1911), p. 969) made a study of the chemistry of the dyes which were suitable for the pinatype process."

Need to find this one too...