Classification of ink Modern inks are mainly divided into four categories according to the version:① Letterpress inkA type of ink used to print books, newspapers, picture albums, documents, account books, etc. The main feature of letterpress printing is that the inked part of the printing plate protrudes from the non-inked part. Letterpress inks are divided int...

Two days of studying-trip starts expectantly. Not like any other times of business trip or tourism, this time I keep wondering. Why we came to Tianjin? And what should we learn? Before this trip, our company has organized several times studies of .