Dampen your samples with water. Submerge each sample in its proper mordant solution and simmer each mordant in a separate heat-proof container, just below boiling, for 30 minutes. Set the sample that won't receive a mordant aside for now.
While your samples are simmering in the mordant solutions, prepare the dyes. Chop or cut up each dye source, place the pieces in a pot or bowl, and cover with hot water as if you were making tea. Let everything steep for 15-30 minutes. You may want to simmer the dye ingredients over a heat source if the solution doesn’t seem to be darkening. Strain out any solids. Do this separately for each dye source that you are using.
When your samples are finished mordanting, pat with a paper towel to eliminate drips, then place a sample from each mordant solution into the separate dye baths. Leave the material in the dye solution for a minimum of 15 minutes or until you see they have taken up color. You may get enhanced results by leaving them in the dye solution longer.
Finally, give each piece of substrate a quick rinse with water, set it out to dry, then compare the color and effectiveness of the different mordant/dye combinations on the different substrates. What do you notice?