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radiation rayonnement electromagnetic waves characterized by wavelength or their reciprocal frequency, intensity, density, spectral composition and thus also their interactions with the environment.

radiation-curing séchage par rayonnement principle of film formation in printing inks whose binding agents link up through the influence of UV or electron beams (ESH).

RAL Design System, RAL-DS système RAL color sample system introduced by Ludwig Gall in 1993 for varnishes and paints in product and room design, e.g. car body paints, painting materials or textile colors. Gall extended the RAL 840-HR from 194 to 1688 color shades and placed it on a CIELAB and/or CIELCH basis (written HLC, maximum 80 grades), whereby all neighboring color samples have a color difference of

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