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Acid Dyes

Acid Dyes

Acid Dyes

Acid Dyes find application for dyeing protein fibers with the main protein fibers where these dyes are used for including :
Other than these, some other areas where these are used in include milk protein fibers like:

Acid dyes have a complex chemistry and usually have sulfur or carboxy group on a molecule that makes them soluble in water. With water being a medium where dyeing process takes place, Acid dyes are generally divided into three classes as per the:

These classes overlap and generally depend on :

Characteristics of Acid Dyes :
Categories of Acid Dyes :
Equalizing/Leveling Acid Dyes:
These acid dyes help in producing similar, single color solid effects and have highest level dyeing properties. Combined in trichromatic shades, the items dyed with leveling acid dyes should not be machine dyed or washed in warm water. Instead, the washing needs to be done in cool water through dry-cleaned/hand washed process.

Milling Acid Dyes :
Mainly used for self-shading, wet fastness of these dyes is available in medium to high range. With some of these Milling Acid Dyes having bad light fastness in pale shades, these dyes are not generally combined with other dyes.

Super Milling Acid Dyes :
These have:
Some of the areas where these are used in include Milk protein fibers like:



There has also been an increasing usage of dyes in the medical sector. Here, dyes act as an important ingredient in many of the medical tests conducted on humans.

These dyes in coordination with latest diagnosis equipment allow flawless handling and high accuracy in tests that are carried out on patients. One such dye example is Fluorescein angiography that derives its name from fluorescein. This dye is successfully used for carrying out tests like Angiogram which provides valuable information about the circulatory system.

The process of using dye in Fluorescein Angiography Test:
This dye has the ability to detect abnormalities like:
All these abnormalities can be seen in the photographs. Based on the arrived results, doctors then decide on the diagnosis and possible treatment options. Almost all dyes that find usage in the medical sector are synthetic in nature with only a few varieties that fall under natural dyes. These dyes are used for applications like:

Use of Dyes in Different Medicines:

Tablets colors are made using tablet coating technology. The coating film on tablets aims to:
There are two types of dyes that are used in film coatings:
Synthetic Dyes:
These dyes are approved by FDA (Food and Drug Administration) an organization that approves relevant dyes in foods, drugs and cosmetics sector.

Natural Dyes:
Here, chlorophyll, anthocyanin, and carotenoid are used at the time prior to printing color tablets, mixing both dry and wet granulation.

Dyes are particularly used in the hard-shelled capsule. These may be from a variety of iron oxide, opaque material like:
Further, soft capsules can also contain pigments/dyes in form of, opaque materials like:
Dyes are also used in syrups where it helps in providing attractive appearance as well as distinguish the preparation from others available in the market. Some of the commonly used dye in syrups includes:
These dyes are added to syrups and adjusted to the essence, for example:
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    Bhavesh Mehta


    Rung International

    Malad West, Mumbai, Maharashtra, India

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