| 摘要 |
<p>Product is a multi-coloured typewriting ribbon, one part of which is impregnated with conventional ink. Spec. the masking material is impregnated in the woven ribbon, or as a covering layer on a non-woven ribbon impregnated with a polymer in solution, such as polyethylene in toluene or benzene. The correction ink contains preferably a neutral wax e.g. paraffin, ester waxes, polyethylene wax or natural waxes, with pigments such as titanium oxide, barium sulphate and aluminium oxide.</p> |
