Hardness- An expression of the concentration of inorganic salts in water which prevents effective cleaning and germicidal action. Hardness is measured in ppm (parts per million) calculated as calcium carbonate’ (CaCO.). Also:

(a) Knoop Hardness - value relating resistance to indentation by a weighted wedge shaped diamond.
(b) Pencil Hardness - a measure related to the hardness of various grades of graphite. Pencil Hardness is related to a polishes’ resistance to both indentation and tearing, Very soft 4B, 3B, 2B, B, HB, F, H, 2H, 3H, 4H, 5H, 6H, 7H, 8H Very Hard.

High Solids- A floor polish which has a 20% or higher non-volatile content. Unlike concentrates, high solids products are generally used without dilution.

Hue- A bluish coloration promoting the perception of depth in clear films.