ok so I don't really have to guess because all materials are actually translucent, so I could see which has ink in it. assuming that all bottles are empty, if you filled up all of them with other dark opaque liquids.
in that case I'm screwed and I'm guessing the emerald bottle.
also I think the blue fedora and Elsie deserve a lot of support.

https://www.theworldismadeofglass.co.uk/product/victorian-small-cut-glass-ruby-scent-bottle/
