A wide array of Pigments are used in paints and plastics, and sometimes mortar. This article will just introduce some of the readily available low cost pigments useful for DIY colouring and experimentation.
- Dull red
- Can make mixes pink, red or brown
- One of the most stable pigments known, iron oxide keeps its colour for centuries
- Red brick dust may be used as a substitute
- Can contain hygroscopic salts, so not good for indoor use
- Various browns
- Can make mixes anything from broken white to dark brown
- White or broken white, depending on purity
- Mixes can produces white, cream, broken white or grey
- Added to cement it promotes organic growth on the cement, making it look weathered & natural
- Likely to turn green if it stays wet
- Various colours
- Mix with cement to produce a more stone-like appearance
- Incorporated into lime mortar to make black mortar
- Black mortar is sometimes prone to premature failure, so its use is best kept to being a minority of the mortar used.
- Gives a pale sky blue colour
- If used in lime based paints it can fade in time
Commercial Mortar Pigments
Tins of pigment are available from BMs at small cost, but most colours are prone to streaking and bleaching during the life of the mortar. Red pigment however is iron oxide, and is very stable.