Download Colour Physics for Industry 1997 by Roderick McDonald PDF

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28). We consider separately the downward (incident) and upward (reflected) components of the incident light beam, assuming that the absorption coefficient is represented by K and the scattering coefficient by S. 21) Home THE INTERACTIONS OF LIGHT WITH MATTER 37 Solution of these differential equations depends on the boundary conditions applied, but in the absence of scattering (S = 0) leads to the Lambert–Bouguer law for the downward flux. 22) where R∞ = J0/I0 is the reflection factor at the surface for a sample of infinite thickness.

The yellow dye absorbs over the near-UV and blue wavelength regions of the visible region with a maximum absorption λmax near 400 nm, the red dye absorbs in the green region (λmax about 510 nm) and the blue dye absorbs in the orange-red region with λmax about 610 nm. These absorption curves have half-band widths (range of wavelengths at half the maximum absorption intensity) of about 100 nm, the blue dye showing some absorption over the whole visible spectrum. 6. The precise hue description will depend mainly on the wavelength position of the absorption band and partly on the band width and the overall shape of the absorption curve, but also on the observer’s personal interpretation of the meaning of the hue terms used.

235 and BS1006 : A01 : 1978. These standard depths are a series of arbitrarily chosen depths, each judged to be equal for all hues, which enable dyeing, fastness or other properties to be compared on a uniform basis. Once the standard depth of a particular dye (or pigment) has been defined, relative strength measurements on subsequent batches are evaluated by preparing the dyed or pigmented sample under defined dyeing or application conditions, and testing strength variations such as 80, 90, 100, 110 and 120% for the sample being assessed.

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