Hi skahnt,
thanks for the fast reply.
if you know that it's not just a container for coloured glass but 3 of them , great!
Then recycling:glass_bottles:colour = clear;brown;green is correct.
(I do sort the coloures alphabetically. that makes  https://taginfo.openstreetmap.org/keys/recycling%3Aglass_bottles%3Acolour#values 
better readable.
Regards,
lyctkel