The use as absorbent paper is rare today, but seen in historical contexts. The clerk pressed a blotter onto the wet document in the period film.
Pro Tip 2/3
Desk Accessory
In antique or traditional desk settings, blotters are often found as part of the set. Her grandmother's desk displayed an ornate ink blotter.
Pro Tip 3/3
Not Stationery
Remember, a blotter is for absorbing excess ink; it's not plain stationery. Confused, the student grabbed a blotter instead of a sheet of writing paper.