Archive for April, 2010

Synthetic Food Colors – Erythrosine and Tartrazine

April 19, 2010


Reddish pink in color, C20H6I4O5 or Erythrosine is one of the synthetic dyes. Its common use is as agent for food coloring & is also in applications as biological stain, disclosing agent for dental plaque, radiopaque medium and printing ink.

Application of Erythrosine is in:

  1. Tinned fruits
  2. Chocolate
  3. Cosmetics & drugs
  4. Garlic sausage
  5. Scotch eggs
  6. Snack foods
  7. Stuffed olives
  8. Dressed crabs
  9. Bakery foods


It is an azo dye of color synthetic yellow and commonly used in syrups, fruit cordials, instant puddings, custard powder, ice creams, mustard yogurt, chewing gums, honey products.

Tartrazine is also used in combination of Brilliant Blue FCF to form different shades of green such as in processed peas.


Reactive Dyes

April 6, 2010

Reactive Dyes basically are aromatic & synthetic structural compounds of molecular base with different types having separate properties & are commonly used in textile industry. These dyes are part of a group of organic substances which are utilized in tinting of textiles.

Some highly reactive dyes are used in exhaust dyeing while moderately reactive dyes are used in continuous dyeing & printing. There are some other types of reactive dyes available which are used in semi-continuous & continuous dyeing and others with usefulness for fabrics, knits and cotton yarns.

Normally the reactive dyes are manufactured for the purpose of permanent dyeing of fibers which are plant based such as cotton, ramie, linen, rayon, hemp, cellulose fiber, viscose etc.

Pthalogen Dyes

April 5, 2010

Pthalogen Dyes are also called as Dyestuffs & Ingrain Dyes is well suited for use in fabrics such as, African print, Batic, Khanga, Fibers and other similar fabrics. The process of dyeing produces light-fast & incomparably brilliant blues and these can be shifted to darker blues or blue greens.

Pthalogen Dyes are most used for dyeing & printing of threads and are also used in retail fabrics for solid shade dyeing.

There are numerous Pthalogen Dyes available as per international specifications as listed below:

  1. Blue I F3GK
  2. Napthol ASG
  3. Blue I BN
  4. Blue I F3G & Copper Complex
  5. Fast Blue B Base
  6. Blue I F3GM