From Ben Hollins
In response to your running piece about “RAS syndrome” (Feedback, 26 February), I thought I should add my tuppen’orth. In our chemistry test today we were asked a question about “OFC copper”, with an explanation that OFC stood for “oxygen-free copper”. When I pointed out this “oxygen-free copper copper” to my teacher, he suggested that I write to you.
Newbury, Berkshire, UK
