When I translated this I was in the stage where I was thinking, gull grey??? gull grey??? what the heck is gull grey??? don't they mean dull grey???
That's why when I translated the Mr. Color Chart I put both Gull Grey and Dull grey for the translation of Mr. Color C11 and the dull grey just kinda stuck whenever I translated color charts.
but yeah, I should be more objective than subjective when translating and really stick to using Gull Grey.