 In addition, he was appointed the Director of Cultural Affairs in the Foreign Ministry, where he remained until his retirement in 1971.While participating in a meeting in Rome, as part of his job with the Foreign Ministry, he acquired the concept of using "Panda" oil pastel chalk, and started to work on a large body of work using this technique, some of them on reproductions and magazine pages (Gideon Efrat states that it was Aroch who introduced the term “Panda” into Hebrew as the generic term for this kind of pastel chalk).In 1964 Aroch exhibited 34 of his paintings in the Israeli exhibition at the Biennale in Venice, some of them drawn using the technique of “Panda” colors.