| 摘要 |
Arrangement for applying written or drawn information onto image carriers for overhead projectors, characterized by an image carrier in film or plate form which comprises at least one coloured eompound, as well as a writing or drawing marker, the writing or drawing fluid of which contains at least one colourless compound, this colourless compound reacting with the coloured compound to produce a colour change. This arrangement avoids the use of dye-containing markers. |
