What paper is used for cad drawings, blueprints, sulfuric acid drawings and white drawings?

Use sulfuric acid paper and special paper coated with chemical coating such as ferricyanide. Sulfuric acid diagram is a diagram printed on translucent sulfuric acid paper. As a base map, it is printed on special paper coated with chemical coatings by exposure, and the blueprint is developed and fixed by ammonia gas to form a blueprint. A sulfuric acid diagram is similar to a negative in optical photography, while a blueprint is similar to a photograph. The exposure principle is the same, but the chemical reactions of development and fixing are different. So the blueprint is called blueprint, and the photo is called development. Repeatedly printing a sulfuric acid diagram can get many blueprints with the same content.