| abstract |
A transparent sheet material which is suitable for projecntion on overhead projectors comprises coated onto a support a nbinder layer containing discrete particles of an organic polymer nwhich has substantially the same refractive index as the binder, nthe polymer comprising from 0.5 to 30% by weight of the nbinder. n The coating gives a good key for typewritten characters nproduced by carbon ribbon or ink ribbon typewriters, for wrinting with e.g. ball-point pen, pencil, water or solvent based ink npens. Indian ink and inked rubber stamps. |