“…For example, if one seeks to determine the influence of a color property (e.g., hue) on a dependent variable, one must control for the other color properties (e.g., lightness and chroma) or systematically vary the values of the other color properties. This was also recognized as important in early research and reviews (Baker, 1900; Bullough, 1908; Gordon, 1912; Lane, 1900; McDougall, 1908; Titchner, 1901; Valentine, 1914), and has been repeatedly highlighted throughout the decades (Child et al, 1968; Crozier, 1999; Dorcus, 1926; Elliot & Aarts, 2011; Erwin et al, 1961; Gelineau, 1981; Guilford, 1940; Hagtvedt & Brasel, 2017; Labrecque, Patrick, & Milne, 2013; Nourse & Welch, 1971; O’Connor, 2011; Pressey, 1921; Sorokowski & Wrembrel, 2014; Staples, 1932; Taft, 1997; Takahashi, 2005; Thönes et al, 2018; Werner & Wooten, 1979). Nevertheless, it has been largely ignored until the present decade (the 1970s being an exception; e.g., Helson & Lansford, 1970; Hopson, Cogan, & Batson, 1971), and even in current empirical work, controlling color properties remains the distinct exception rather than the rule.…”