ABSTRACT
The suitability of using 2-hydroxy- 1,4-naphthoquinone [Lawsone,I] and some of its synthesized derivatives [II-VI ] as a pigment for printing natural fibers [cotton, wool and silk] was investigated. The effect of varying the structure of 2-hydroxy-1,4-naphthoquinone on the properties of the printed samples was also studied. No change of color and color strength has been observed by introducing -CH2-N [CH2CH2OH] 2 or CH2-N[Et]2 groups in the 3- position of 2-hydroxy- 1,4-naphthoquinone [I] to give derivatives [II] or [III], respectively. On the other hand, the printed samples with semicarbazone derivative [IV] or oxime derivative [V] of 2-hydroxy-1,4-naphthoquinone resulted in an observed change in color and color strength. Furthermore, derivative VI produced by substitution of methylene link in 3-position of a dimeric Lawsone has no affinity for printing cotton, wool and silk