Diadona shoes turned red in the 1980s.

Does the subject want to ask "the reason why Diadona shoes turned red in the 1980 s"? Pigment migration and long-term sun exposure.

1. Pigment migration: white shoes are made of different materials. When they come into contact with colored substances, such as dark clothes, dyes, wet ground or dirt, the pigments will be transferred to the shoes, resulting in local or overall redness of white shoes.

2. Long exposure to the sun: white material is easily affected by the sun and turns yellow or red. When white shoes are exposed to the sun for a long time, especially in hot weather, the shoes will gradually change color and appear red.