colourant BrE technical , also: colouring agent BrE , also: colouring matter BrE
colorant AmE

As a food colourant it is not known to produce any adverse effects.

Rich, red colourant enhances the condition and cut of this style.

Too much blue generated from rutile used as a colourant.

According to reports in China Daily, the colourant used is believed to cause cancer.

A colourant can also be derived from the seed.

Primarily aimed at the paint industry they can provide a cost effective colourant across a variety of applications.

Turmeric is also more widely used as a colourant for textiles and food products.

A 'colourant' or 'colorant' is something added to something else to cause a change in colour.

It acidifies the soil and is used as a hydrangea colourant to keep the flowers blue.

Henna, the vegetable colourant, was a favourite with the ancient Egyptians and is still popular today.

It is the colourant in "chrome green" and "institutional green."

An architectural coating to which colourant is added after packaging in sale units to produce a desired color.

• Acid Blue 127 is used mainly as a colourant for soap and in the processing of cleaning products.

Fill their shower head with red food colourant for that 'Psycho' shower effect.

It was also used as a colourant, especially for paint, that is referred to as Madder lake.

In mid-ocean water, the only colourant is chlorophyll-bearing phytoplankton and its decay products.

Replacement of the magnesium with copper yields a bright green pigment which can be used as a food colourant.

Tinted float is produced by adding a colourant during a float glass production run.

Its first hair care product, the power shampoo, was launched five years later and its first colourant in 1960.

Natural colourant adds richness to long, wavy hair.

"The fact that it is a known, approved food colourant would, on the face of it, appear to make this a compelling starting point.

It's got a very clever chemical colourant in it, to give it a unique cream tint.

Furthermore, counsel added, the evidence reveals that, using cobalt acetate as a colourant is not the best manufacturing process.

Excessively heavy coats applied causing flotation of the colourant.

A new organic tanning water uses caramel as a colourant to achieve a sun-kissed glow.