Sadly there are no tips and notes for colours, which is a shame because they aren't as straightforward as one might hope.
There are three "colours" that are used as normal adjectives: red (-ekundu), black (-eusi), and white (-eupe). The rest use -a. "Shirt of (the colour) blue".
does this come from the English/european word blue/Blau/bleue, or does it have actual african origins?
" la" it is " of " sing. 5/6 JI - MA class. Rangi "ya" - because it is 9/10 N-N class etc. A propos - blue without english influances in kiswahili is - samawati / samawi ( light blue ) and - nili - indygo, dark blue.