Raising-cloths are of various kinds and may be merely mediums with a heavy weft, or "condensor" weft made from waste yarns.
I work with quite a few different mediums to create my art, including digital, Copic markers, acrylic, and watercolors.
Many reputed "clairvoyants" developed into mediums (q.v.).
I have refracted it with Prismes, and reflected it with Bodies, which in Day-light were of other colours; I have intercepted it with the coloured film of Air interceding two compressed plates of glass, transmitted it through coloured Mediums, and through Mediums irradiated with other sorts of Rays, and diversly terminated it; and yet could never produce any new colour out of it.
The experiments were conducted with his own family and friends without professional mediums, and in some of them he was assisted by M.