The PDF "Australian Bred and Raised (Sported) Roses as recorded by the Australian Registrars,
and with the recognition of the American Rose Society", no date, available on line, lists 'Plaisante' as mp, meaning medium pink. Traces of Plaisante have faded so completely that this is the only indication of its colour I have been able to find. I wonder if any other member of HMF can do better.