DISPOSIZIONE PER L'APPLICAZIONE DI RAPPRESENTAZIONI SCRITTE O GRAFICHE SU PORTA-IMMAGINE PER LA PROIEZIONE OVERHEAD

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 colored compound, as well as a writing or drawing marker. The writing or drawing fluid of the marker contains at least one colorless compound which reacts with the colored compound to produce a color change.