Color Dyes and Adsorbents

Synthetic dye Natural adsorbent Acid-based Rada-Mayya Kostadinova profile dye is a synthetic water-soluble and dispersible organic compound that colors natural water when released into the environment. They are widely used for coloring products in dyestuffs, textiles, rubber, leather, paper, plastics, cosmetics and other industries and are always in industrial waste. Synthetic dyes, suspended solids and dissolved organic matter are the main harmful substances of fabric wastewater.

Sarah Bellos: I work with my sister Artisan Natural Dye Works to provide dyeing services to independent designers. We only use natural dyes, dozens of colors. All of these are labor intensive. We recognize that it is possible to modernize the use of natural dyes, but the dyes themselves do not meet the consistency, quantity or reliability we need. Formation of Stony Creek has come from this experience. Velos: Raw materials are more expensive than petroleum dyes. Synthetic indigo is made from toxic and dangerous chemicals such as formaldehyde and cyanide. Those chemicals are very cheap. You can make synthetic indigo and you can make a pair of blue jeans for just a few cents. This is a big challenge for bio-based dyes. We say that all these external factors such as hydraulic crushing and oil spills are not included in cost. We do not manufacture synthetic indigo in the United States. Because it is the point of competition.

The color of Shixi is convinced that tobacco farmers cultivate indigo and establish natural dye business.

Many synthetic dyes are easier to manufacture, cheaper to produce and superior in coloring performance compared to naturally occurring substitutes. Some synthetic food colorants are diazo dyes. Diazo dyes are prepared by coupling a diazo compound with a second aromatic hydrocarbon. The resulting compound contains conjugated systems that are effective to absorb light in the visible part of the spectrum, ie they are dark. The attractiveness of synthetic dyes lies in their color, lipophilicity and other properties that can be designed by the design of particular dyes. The color of the dye can be controlled by selecting the number of azo groups and various substituents. The yellow hue is usually achieved using acetoacetanilide. Red is usually an azo compound. Indigo and indigo carmine have the same blue color, but the former is soluble in lipids, the latter already being water soluble as it is equipped with sulfonate functional groups.