In this short, I get properly nerdy about a question I keep seeing pop up: is the Majohn P140 feed actually ebonite, or is it just plastic dressed up as “ebonite”? Instead of guessing, I run four quick, real-world checks that you can do at home: a visual inspection for injection-mould marks vs a machined/hand-finished look, a cut/sand check to see what the material looks and feels like beneath the surface, the classic smell test (that warm rubber/“tyre” scent ebonite gives off), and a simple chemical comparison using acetone. To keep it honest, I compare the P140 feed directly against a known ebonite feed from a KanWrite Heritage, and I also reference my Asvine C80 acetone test where the feed clearly doesn’t behave like ebonite. The result here is pretty straightforward: the Majohn P140 feed and the KanWrite ebonite feed behave the same in every test, which strongly suggests the P140 feed really is ebonite. And the bigger takeaway: for most people, the material debate matters less than performance—and in my experience, the P140 writes beautifully, which is what counts.