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Tannic acid:
When tannic acid is used with ferrous sulphate, it gives blue or black color. It is commonly used as a mordant for cellulose fibers.
Tin:
Tin is available from tin crystals, stannous chloride, murate of tin and tin salts. It is used with other agents as a modifying agent and brightens the dye colors. Extra caution is needed when used because it is poisonous.
Natural Dyes for Traditional Printing
The main source of natural dyes is plants, animals and minerals. Till the discovery of synthetic dyes, it was the only thing which was available to dye clothes. Normally, all the regions use primary colors like yellow, blue and red and the combination colors of those like brown, green and orange.
The common sources of some colors and the parts from which they are obtained are as follows:
 • Red color is obtained from Manjistha (Rubia cordifolia) from its bark.
• Brown is obtained from Kachha katha (Acacia catechu) from its extract, from Acroth (juglansregia) from its bark, from Babul (Acacia arabica) from its seed.
• Yellow orange from Lal Chandan (Adenanthera pavonina) from its bark.
• Beige from Fuel wood (Dipterocarpus turbinatus) from its saw dust.
• Mustard form Marigold (Tagels erecta) from its petals.
• Golden from Henna (Lawsonia inermis) from its leaves.
Traditional Printing Process
The color is evenly spread out in a tray and then the block is dipped in the color. Then the blocks are applied on the fabric. Then strokes are given on the wooden block so that good impression is created. On the outer side of the block, a mark is there which gives a guideline for the printer as to when to repeat. When the printer wants to do a multiple color design, he can dip his block in the second color. The printer has to be careful about the fact that both the colors should not give some other color. A single color design can be produced faster.
The fabric needs pre and post processing. Complete processing of the fabric needs 3 to 4 weeks. Castor oil is used to give softness to the grey fabric.
A wash is needed after every treatment. Every color needs a different time to develop. Basic colors like red and black take 7 to 10 days for developing. After developing of the color, one wash is required.
Scope of Traditional Printing
All the regions do not give much attention to final finishing. There is a greater need to give attention to the final product.
In hand block printing, flowing water is needed. The use of alternative sources can save the environment and labor too.
If proper attention is given to this art, it can give employment to many people and can even preserve the local folk and traditions. It is a good prospect for export market also.
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