They knew how to raise silkworms and make silk from the worms. "They wore blue-colored clothes, with gold decorations made with blue, red, purple colored threads. (from Samgukji 13th, Ohwanseonbi Dongyijeon)
From the Goguryeo tomb mural painting, the patterns of Jeommun and Wonmun and dyeing skill "Samhil" are shown. Also they are appeared in Shilla's craftwork, showing the relationship of those countries.
The king wore "Ochae", clothing with colors. Officials wore blue-colored clothing, while civilians wore brown-colored clothing.
In Baekje, they made differentiation of the classes of the officials according to the colors of clothing. This shows they have had the colors of red, blue, yellow, purple, and green. Relics of these ages - Sasin-do and Ilwol-do in Gongju Songsan-ri tomb and Sasin-do, yeonhwamun, cloud patterns in Buyeo Neungsan-ri - show red, yellow, blue, and gray colors showing their high skills for dyeing.
In Shilla, they made red-, green-, blue-, and yellow-colored clothes for different classes of the officials. From the color, we could find they used botanical dyeing pigments such as Jacho, Ggokduseoni, Jjok, Hwangbyeok, and Ulgeum. Also, they installed the department of dyeing to develop various skills for dyeing.
Goryeo produced dyed products in private and public factories. To cover dyeing-related affairs, they appointed professional pigment-maker and dyer in Doyeomseo - public dyeing factory. Dyeing with Jacho was very famous, enough to be known to China and have own superior kind of Jacho. They also had a map of planting Jacho that prohibited gathering Sanjacho.
Home-handicraft, rural-handicraft, and small factory produced dyed products for export and people of higher class. Dyeing factory was divided into blue-dyer 30 persons, red-dyer 20 persons, yellow-dyer 20 persons. As with these dividing, blue and red color is the most important colors. Blue color was dyed with Jjok. Red was dyed with imported Sobangmok and honghwa. Before 1800s when chemical dyeing pigments were imported, they usually used botanical dyes such as Chija, Ulgeum, Hwangbaek, Honghwa, Somok, Jacho, and Jjok. As mordants, caustic soda, lime soda, acid of Omija, acid of Omae, alum, and Cheoljang.