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..
10.
Dyeing
fibers: a) Acid dyes (Acid Blue 25, Acid Red 87)
3
dyeing activities are offered. In each one you will find 5-mL vials
with warmed dye solutions, “multifibers 6” and pieces of pure cotton
or wool.
What
you will need
Acid Blue
25 = Eosin Y (AB),
Acid Red 87 (AR),
MULTIFIBRE 6 (Testfabrics Inc.),
pieces of pure cotton, wool,
vials
5 and 50 ml, Leukosilk as labels, tweezers, tissue paper, straw spatula,
plastic Eppendorf pipette, hot plate.
Experiment
1.
Prepare a dyeing bath by introducing the smallest quantity of each dye
into a 5-mL vial.
2.
Add 3 mL of distilled water (tap water is fine too) and 1 drop of
concentrated acetic acid.
3.
Heat to 80°C on a hot plate and then immerse pieces of multifiber
6 intoeach bath.
4.
Mix the solution busing a pincette in order to get a full contact between
the fiber parts and the dye in the solution.
5.
After 1-3 minutes pull the multifiber out of the vial with the pincette.
6.
Work in a tray, avoid dropping of the dye solution on the working bench
and/or your hands.
7.
Photo 4: Rinse the multifiber well with water in a 50 mL
vial and let it dry on a tissue paper.
Questions:
1.
What
fibers are best dyed by the acid dyes? 2. Why? 3. What is
the kind of interaction between this fibers and the dyes?
Copyright:
Mordechai Livneh......back......go
on....German.................................last
modifications: 18.04.2003