Fig. 2From: Dyeing and fastness properties of Quercus robur with natural mordants on natural fibre a Colour strength (K/S) of the dyed fabrics using Salix alba L. (wood ash). M1: without mordant, M2: pre-mordanting, M3: simultaneous mordanting, M4: post-mordanting. b Colour strength (K/S) of the dyed fabrics using Populus deltoides Bartram Ex Marsh. M1: without mordant, M2: pre-mordanting, M3: simultaneous mordanting, M4: post-mordantingBack to article page