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Straw for dyeing in bright colors soft you'll first need to bleach. Bleaching can be done with hydrogen peroxide or hydrosulfite (see Bleaching Straw). Before bleaching straw to boil in water for 1 hour to remove the silicic acid, which prevents a uniform color. If the handle rough tough straw, then water is added to the 1 to 2% borax. After bleaching straw thoroughly washed with water and a small amount of acetic acid. Most suitable for dyeing straw are acid dyes, with which you can get the most diverse, beautiful and vibrant shades of sufficient strength. The very process of dyeing is carried out as follows.
In the cauldron of water and pour poured from 1 to 3% acetic acid density of 6 ° from Bome. Dissolve in boiling water colors, added through a fine sieve into the pot and mix well. Number of dye taken from 3 to 35 grams per kilogram of straw, depending on the desired hue.
Put boiled or bleached straw in a cold dye solution and then gradually heating for about 0.75-1 hours bring a solution to a boil and maintain a low boiling temperature, until the straw does not paint over, ie for about 1-3 hours. Then stop heating, rake out the heat from the furnace and leave the straw in the solution for another hour, and for painting in dark colors for a whole night. Then Sodom removed from the pot, thoroughly rinsing and dried in air at ordinary temperatures.
When repainting worn straw hats, they must first be boiled in water with the addition of soda ash and ammonia. In addition to dyeing straw stalks practiced dyeing straw bundles.