AbstractA filtration‐type light scattering cell effectively sealed against contamination by a liquid trap and by a long helical impingement filter is described. Very low stray light levels are achieved by means of large cell diameter and a narrow light beam. Modifications in the Brice‐Phoenix light scattering instrument necessary for the proper application of the cell are discussed. The intensities and angular dependence for water observed in this cell are in very good agreement with those obtained after multiple distillation. The excess scattering curve for 3 phosphotungstic acid in 0.3MNaCl and 1MHCl is that of a Rayleigh scatterer in the range observed (25.8 to 13
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