 |
||||||||||||||||||||||||||||||
|
||||||||||||||||||||||||||||||
|
| Ayur Vastra
» Natural Colour Natural Colour  Ayurvastra
is also becoming very popular for its colour properties. The shades
thus produced are very different and natural thereby giving you an
all the more a different look. The roots, flowers, leaves, seeds and
barks of around 200 herbs are used to make the dyes. Since the natural
herbs are generally found in very beautiful shades. The shades can
further be lightened or darkened from the same single herb by adding
more or less quantity of the particular herb.
Shade Variation  Shade
difference in two different batches of same shade could be approximately
10-20%. This is largely due to the fact that the numerous chemical
ingredients that make up plants vary widely. Not only do the variations
occur between plants of the same species, but also from part to part
of the same plant. For instance, in Amla, the medicine is contained
in the fruits, not in its leaves or roots. The type and quantity of
chemicals present are influenced by such factors as soil, species,
weather, time of harvest as well as the part of the plant used. The
manner in which they are stored and processed also has a profound
effect on its extractions.
Traditional crafts are not always simple. Medicines prepared in an iron pot give a colour different than the same ones prepared in pots made out of clay or wood. To obtain desired colour quality, time and again, the dyer has to know all these. Creating some colours with natural dyes is a very complicated process and is viable only if it is done commercially.
The quantitative "fading rates" for natural dyes are not practical because differences in fading rates for the same natural dyes have been reported in many cases. 
|
Fading of
dyestuffs by light radiation is one of the most important factors
influencing the useful wear life of clothing. The loss and change
in colour of dyed textiles upon exposure to light is a complex reaction
affected by both the chemical and physical state of the dye. External
factors such as the source and intensity of illumination can affect
the reaction as well. Herbal dyes are mainly having carotenoids,
flavonoids, indigoids or quinoid structures. Although flavonoid
compounds are not very lightfast, quinoids and indigoids are noted
for their excellent fastness properties. Stereo chemistry of the
dyes also having much effect on the light fastness for example,
symmetrical dye molecules usually exhibit greater light fastness
than non-symmetrical dye molecules, and larger dye molecules generally
provide faster dyeing than smaller ones.