The wealthy in Guang[zhou] maintain numerous foreign slaves. These slaves are unequalled in strength and are capable of carrying - on their backs - several hundred catties. Neither their language nor their passions bear any connection to ours. Their natures are simple; they do not attempt to flee. For their part, the people of Guangzhou call them "wildmen".  
As for the colour of these slaves, it is as black as ink. Their lips are red and their teeth are white. Their hair is curly as well as ochre-coloured. They are both male and female, and they inhabit the various mountains across the sea (Zhu Yu, 1921, 2.4).  
Zhu Yu concludes by also referring directly to the slaves that the Chinese specifically called by the name Kunlun, stating: 'There [also] exists a kind of wildman that lives near the sea. These slaves are able to immerse themselves in water without batting or blinking their eyes. They are called Kunlun slaves' (Zhu Yu, 1921, 2.4).  
Zhu Yu above proffers the existence of two groupings or classifications of Guangzhou slave, and whereas the latter category might conceivably have consisted only or predominantly of ethnic Malays, the former one seems extremely unlikely to have. The looming but vexing question is whether Africans comprised any part of either group. Moreover, in hazarding to speculate, we find that resorting to a stereotypical racial characteristic so familiar as blackness of skin complexion is of no use to us because the Chinese considered it to be a trait common to all Kunlun.