First 228 words of the document:
Chemistry Working For Us
PAINTS DYES AND PIGMENTS
Transition metals have important compounds which can be used for dyes or pigments, this is because
the compounds is coloured
Compounds which are insoluble are used as pigments whereas compounds which are soluble are
used as dyes.
PIGMENT-An insoluble, coloured compound used in paints
DYE- A soluble coloured compound which will form a chemical bond with a fabric
The powdered pigment can be mixed with a liquid to form a suspension-this is then used as a paint
White paint will normally use titanium dioxide.
Emulsion paints have pigments dispersed in water along with a polymer(PVC or acrylic resin), when
the water evaporates the pigment is left on the surface.
Gloss paints use oil, so white spirit has to be used to clean the brush. The paint includes a solvent
which evaporates as paint dries and other chemicals which oxidise to give paint hard wearing finish.
Dyes are soluble and form a chemical bond to a fabric, some require a mordant.
MORDANT-A chemical which binds a dye to a fabric
Dyes used to be made from natural sources.
Raw material for dyes is likely to be coal or oil
Making of dyes involve carcinogenic chemicals