Science as Inquiry Design and Conduct Scientific Investigations Dyes are readily obtained from many plant materials but the color obtained may not be at all what one would predict. Students conduct experimental inquiry as to the color of natural dyes obtained from a variety of plant sources. The bonding of natural dyes is often pH-dependent, involving the transfer of hydrogen ions. Using two natural dyes, student observe the effect of changing pH on the colors produced. Physical Science Structure and Properties of Matter Bonds between atoms are created when electrons are paired up by being transferred, or shared.
Mordants allow dyes to bond to fibers by bonding both to the fiber and the dye molecule.
Several mordants are investigated for their effect on natural dyes. Science and Technology Scientists in different disciplines ask different questions and use different methods of investigation. Considerable work has gone into the study of the fading process and all manufacturers carry out tests for colorfastness. Using the samples of wool which they have dyed, students model these tests. 1995-1997 Page maintained by Steve Gentle, Research Associate.