Tu veux ceux qui sont dorés ou argentés ? Accepted :)
Could 'en' be used in this sentence?
En or and en argent ? Yes, why not, but that would be much more expensive.
"tu veux ceux qui sont dores or argentes" -- I don't understand why masculine doesn't work just as well here
You wrote "or" instead of « ou » ! :)
It rejects the masculine even with ou correctly entered 19 Jul 2020. I reported it.
The masculine is accepted so you must have had another error - what was your full answer? :)