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Thank you very much, what are recurring colours?

They are colours you use a lot in your work. Perhaps I am mistaken but blue is one I seem to remember you use frequently, as a background. Almost like a consistent feature of yours. Perhaps though it's just my personal perception.

Yes you are right!!!! Buon osservatore e quanto sei attento!!!! I use more cold colours as backround for evidencing more the warm colour of the subjects skin ;-D