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When I traded my reddish blue Sport in a few years ago, whoever was responsible for typing up the dealer's second hand stock sheet didn't believe anyone would call a colour reddish blue. It ended up on their website as "reddish red"
I asked a body shop guy the same question a while back. He says its surprising how much red paint actually gets mixed into `reddish blue` it think from memory it was 30-40%. I think the sonic blue looks better anyway (maybe im biased)