Macbeth

Color-order systems, such as the many MunseU collections available from Macbeth, have been described previously. Essential for visual color matching is a color-matching booth. A typical one, such as the Macbeth Spectrahte, may have available a filtered 7500 K incandescent source equivalent to north-sky daylight, 2300 K incandescent illumination as horizon sunlight, a cool-white fluorescent lamp at 4150 K, and an ultraviolet lamp. By using the various illuminants, singly or in combination, the effects of metamerism and fluorescence can readily be demonstrated and measured. Every user should be checked for color vision deficiencies. 

A. H. MunseU, A. Color Notation, 14th ed., Macbeth Division of KoUmorgen Instmments Corp., Newbaugh, N.Y., 1990. 

Macbeth and Price- have shown that in ethanolic solution the tautomeric equilibrium between 225 and 226 is about 80% in favor of the hydroxy form (225) when R is H and that the equilibrium is shifted still further toward the hydroxy form when R is NO2 by comparison of the ultraviolet spectra of the parent compounds and... 

Fig. 27. Approximate boundary of the low-velocity burn-out regime for water flowing in round tubes. The low-velocity regime lies to the left of any given curve [from Macbeth (M2)].

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