Blue and yellow are the colors of the caste, or subcaste, as the case may be, of the Slavers
Blue and yellow are the colors of the caste, or subcaste, as the case may be, of the Slavers. Some, as noted earlier, regard the Slavers as a caste independent of the Merchants, some regard it as a subcaste of the Merchants. The colors of the merchant caste itself are white and yellow, or white and gold. Needless to say, caste members do not always wear the caste colors. For example, a scribe would normally wear his blue when working but not always when at leisure. Goreans are fond of color and style in their raiment. They tend to be careful of their appearance and often delight in looking well. Not all slave papers are bound in blue and yellow, of course. I had seen copies in the pens which were in plain folders, in envelopes, and such. Indeed, some had been merely clipped together.
Witness of Gor, p. 519