The Forel-Ule scale revisited spectrally: preparation protocol, transmission measurements and chromaticityS. Novoa, M. R. Wernand and H. J. van der WoerdJ. Eur. Opt. Soc.-Rapid Publ., 8 (2013) 13057DOI: https://doi.org/10.2971/jeos.2013.13057