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INTRODUCTION

A dye can generally be described as a colored substance that has an affinity to the substrate to which it is being applied. The dye is generally applied in an aqueous solution, and may require a mordant to improve the fastness of the dye on the fiber.
Both dyes and pigments appear to be colored because they absorb some wavelengths of light preferentially. In contrast with a dye, a pigment generally is insoluble, and has no affinity for the substrate. Some dyes can be precipitated with an inert salt to produce a lake pigment, and based on the salt used they could be aluminum lake, calcium lake or barium lake pigments.
By far the greatest source of dyes has been from the plant kingdom, notably roots, berries, bark, leaves and wood, but only a few have ever been used on a commercial scale.

 
BETA NAPHTHOL
Purpose : Dye & Medical Industry.
Package : 25kg/Bag, plastic lining, outer woven bag.
Storage : Dry ventilated place.
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CRUDE NAPHTHALENE

Naphthalene is a white solid with a strong smell. More common names that are used are mothballs, moth flakes, white tar, & tar camphor. Naphthalene is a natural component of fossil fuels such as petroleum & coal it is also formed when natural products such as wood or tobacco are burned. Naphthalene is used in the manufacture of resins, phthaleins, dyes, pharmaceuticals, insect repellents, & other materials. Other items around the home that are made from naphthalene are moth repellents, in the form of mothballs or crystals, and toilet and diaper pail deodorant blocks. Naphthalene is also used for making leather tanning agents, and the insecticide carbaryl.

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tOBIAS ACID
Chemical Name 2- Amino-l-naphthylenesulfonic acid
Molecular Formula   C10H9NO3S
Molecular Weight    223.25

Properties: Pink needle crystal, slightly soluble in water. Its salts of sodium and ammonium are easily soluble in water.
(ß-Naphthylamine can be tested at buyer’s request.)

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J ACID

Chemical Name  2-Amino-5-Naphthol-7-Sulphonic acid
Molecular Formula    C10H9NO4S
Molecular Weight     239.25

Properties: Slight soluble in hot water & hardly soluble in alcohol. Its alkali salts are easily soluble in water. Solution of J acid gives a brownish black precipitate met with hot ferric chloride, and gives a yellowish brown precipitate met with calcium chloride. It couples with diazotized bases at the 1 – place in acidic medium and at the 6-place in alkali medium.
Application: an important intermediate of dyestuffs. A large number of reactive or direct dyes are manufactured from N-Aryl-J-Acid, Bis-J-Acid, Carbony-J-Acid and other derivatives of J Acid.

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