Abstract
A number of studies over the last 35 years have suggested that the counts of distant galaxies and quasars may be modulated by the presence of dust in intervening galaxy clusters. Required extinctions are in the range 0.2 < A B < 0.5, widely distributed within the clusters. Extinction should also affect the colours of galaxies, and this reddening is potentially detectable in existing data, if the amount of extinction spread throughout nearby clusters is as large as that proposed (in more distant clusters) to explain the background counts. To test for reddening, we examine the relation between the Mg 2 index, which is insensitive to reddening, and B−V colours, which are affected by reddening, for a large sample of elliptical galaxies
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