Witthoft N, Winawer J, Eagleman DM (2015) Prevalence of Learned Grapheme-Color Pairings in a Large Online Sample of Synesthetes. PLoS ONE 10(3): e0118996. https://doi.org/10.1371/journal.pone.0118996
Colour associations for different letters for people with grapheme-colour synesthesia. This is from a sample of 6588 synesthetes in the US, reported in Witthoft, Winawer, and Eagleman 2015.
It's not only sound and smells that stimulate synesthesia, associating a colour to letters is one of the first sines of synesthesia. This study from PLUS ONE presents the associations for different letters for people with grapheme-colour synesthesia

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