When were ditto machines replaced by copiers in schools?

Ditto machines, also known as spirit duplicators, were widely used in schools until the late 1970s and early 1980s. They were gradually replaced by photocopiers, which offered higher quality prints and greater efficiency. The transition was largely completed by the mid-1980s as photocopying technology became more affordable and accessible. This shift marked a significant change in how educational materials were produced and distributed in schools.