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n spectroscopy
One of several techniques for measuring and assessing the colour of a pigment
including EDX (energy-dispersive X-ray analysis), microspectral analysis and FTIR
(Fourier-transform infrared). Another technique called ‘Raman micro probe
spectroscopy’ has been used to examine the chemical components of the ink used
in the Vinland Map and to prove it a fake thus discrediting the theory that the
Vikings reached North America before Christopher Columbus.
n spectrum
The range of colours produced by the dispersal of white light through a prism
– first explained by Sir Isaac Newton (1642-1727). The colour spectrum is a contin-
uous band of merging colours the divisions of which depend on the speed at which
the colours comprising white light travel through a prism – red light, for example,
having the longest wavelength, thus passes through a prism more quickly than
colours with shorter wavelengths. The colour spectrum extends from invisible
infrared passing through the seven visible colours of the rainbow (red, orange,
yellow, green, blue, indigo and violet) and ends with the invisible ultraviolet.The
colour spectrum always displays itself in the same fashion whether in the spray
of a water fountain, in a crystal glass, through a prism or in the rain. The full
electromagnetic spectrum embraces many different kinds of energy from radio
waves, microwaves, radar, infrared light through to ultraviolet light, X-rays,
and other short wavelength high energy radiation such as gamma rays.
Apparently, bees’ vision embraces ultraviolet light and owls can see into the
infrared part of the spectrum.
a spicy
‘spicy colours’ The Times (12.3.99).
c spinach green
Olive green or a yellowish green.
c spinel red
The scarlet or purplish red colour of the precious stone of the same name similar
to the ruby.
n spirit colour
Pigment mixed with a very thin application of fluid and formerly used as a varnish;
colours or dyes such as ‘spirit-blue’, ‘spirit-yellow’ and ‘spirit-brown’ made from
a tin solution.