karnemelk omdat ’t zo fris is (Buttermilk Because it’s so Refreshing)
Bruna cut back on his work for the A.W. Bruna & Zn. Company in the 1970s and took on more and more independent assignments. An example of this is the series of buttermilk posters he designed for the Dutch Dairy Office. Bruna effectively conveys the message by placing bright colours against a white background and the glass of buttermilk right in the centre. He won a prize for this design in 1971.