Blue paper
Blue paper is a blue-dyed rag paper, historically used as a support for drawings and prints. The earliest extant mention of blue paper dates from a 1389 Bolognese statute.
Blue paper is a blue-dyed rag paper, historically used as a support for drawings and prints. The earliest extant mention of blue paper dates from a 1389 Bolognese statute.
Blue paper is a blue-dyed rag paper, historically used as a support for drawings and prints. The earliest extant mention of blue paper dates from a 1389 Bolognese statute.
Source: Wikipedia "Blue paper" · CC BY-SA 4.0
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