In papermaking, a translucent emblem, or , can be produced by pressure from a raised design on a mold. It is visible when a sheet of paper is held up to light. These were used in Italy as early as 1282, and as they grew in popularity, they began to be used to designate sheet and mold sizes as well as paper grade.

In papermaking, a translucent emblem, or watermark, can be produced by pressure from a raised design on a mold. It is visible when a sheet of paper is held up to light. These were used in Italy as early as 1282, and as they grew in popularity, they began to be used to designate sheet and mold sizes as well as paper grade.

Explanation:

A watermark is an image that can be seen in paper, it can be seen in light. This tecnic has been use for stamps, currency, and so on. Italy frst used it, and then it became a known practice in other countries as well.

its d i know cause i've been googling it