حقائق غير معروفة عن رقم صباغ

?? ???? ???? ?????? ???? ?????? ?????? ???? ??? ?? ??? ????? ???????? ???? ??? ?????? ???? ??? ??? ??? ?????? ?? ??? ???? ?? ??????? ??? ???? ?????.Vat dyes are effectively insoluble in h2o and incapable of dyeing fibres instantly. Nevertheless, reduction in alkaline liquor creates the water-soluble alkali metallic salt of the dye.???? ???? ??? ???

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