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Colours that lie adjacent to one another in the colour wheel. For example, yellow and blue are harmonic to green.
Glossary
A watercolour paper which has a hard, smooth surface. It is ideal for very detailed work but its drawback is that the paint has a tendency to run.
Compare with NOT and Rough papers.
Glossary
A hue refers to the gradation of color within the optical spectrum, or visible spectrum, of light. “Hue” may also refer to a particular color within this spectrum, as defined by its dominant wavelength, or the central tendency of its combined wavelengths. For example, a light wave with a central tendency within 565-590 nm will be yellow.
Reference from Wikipedia definition of hue.
Glossary