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  2. Heliographic copier - Wikipedia

    en.wikipedia.org/wiki/Heliographic_copier

    In the "argot" of engineers, architects and designers, the resulting plan copies coming from any type of heliographic copier no matter they were either blue or white, were traditionally called blueprints, name derived from the blue background color of the cyanotype technique, which was the previous process for obtaining blueprints, When the ...

  3. Payne's grey - Wikipedia

    en.wikipedia.org/wiki/Payne's_grey

    Payne's grey is a dark blue-grey colour used in painting. Originally a mixture of iron blue (Prussian blue), yellow ochre and crimson lake, [2] Payne's grey now is often a mixture of blue (ultramarine, phthalocyanine, or indigo) and black, [3] [4] or of ultramarine and burnt sienna.

  4. Whiteprint - Wikipedia

    en.wikipedia.org/wiki/Whiteprint

    Whiteprint plan copy. USSR whiteprints. 70s. Whiteprint describes a document reproduction produced by using the diazo chemical process. [1] It is also known as the blue-line process since the result is blue lines on a white background.

  5. Luminous paint - Wikipedia

    en.wikipedia.org/wiki/Luminous_paint

    Radioluminescent paint is a self-luminous paint that consists of a small amount of a radioactive isotope (radionuclide) mixed with a radioluminescent phosphor chemical. The radioisotope continually decays, emitting radiation particles which strike molecules of the phosphor, exciting them to emit visible light.

  6. Cyanotype - Wikipedia

    en.wikipedia.org/wiki/Cyanotype

    The cyanotype was discovered, [2] and named thus, by Sir John Herschel who in 1842 published his investigation of light on iron compounds, [3] expecting that photochemical reactions would reveal, in form visible to the human eye, the infrared extreme of the electromagnetic spectrum detected by his father William Herschel and the ultra-violet or 'actinic' rays that had been discovered in 1801 ...

  7. Help:Using colours - Wikipedia

    en.wikipedia.org/wiki/Help:Using_colours

    Diverging colour ramps (two colour extremes around a white or black neutral value) tend to hide some high-frequency features. Colours have cultural connotations; pick ones that match your data. That is, a diverging colour ramp with extremes " hot , cold " will be easier to understand than the reverse ( hot , cold ).

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