The Justice Ministry will revise the bedding and uniform designs of male prisoners to improve the way inmates are treated, ministry sources said Saturday.
Male prisoners have used futon with vertical orange and green stripes since around 1950. But psychologists say the two "clashing" colors make inmates nervous and aggressive.
The psychologists also pointed out that prison-issue clothing -- gray shirts and pants, black-and-white striped pajamas and khaki work uniforms -- "lack brightness."
They urged the ministry officials to use brown and other warm colors for mattresses, and light blue and mint green for clothes, according to the sources.
The ministry will also consider changes for female inmates, who account for just 5 percent of all prisoners.