Here's some more info from Stefano Lazzaro:
"In the attachments is an ex-Hungarian MM 21758, returned to Italy and recovered after damaging in North Africa, and a (faded) color picture of a pre-war RA example. Note the pattern. As for the paints, most sources agree for a Giallo Mimetico 3 (FS 33434) background, often sparse spots of reddish brown (Marrone Mimetico 2 - FS 30109 or Bruno Mimetico - FS 30215), these almost completely covered by large mottles of Verde Mimetico 3 (FS 34102). Recent researches state that undersides were most probably aluminium paint rather than grey (see Norwegian 310s attached). Front face of propeller blades should have been a light bluish grey like FS 36473 to 35526."