Corallines jelly drink

Saw this drink made with corralline algae and got it because I have never heard of it.

There were four flavours: prune, grapefruit, grape and mixed fruit.

I got the grapefruit and one which I thought was natrual but it turned out to grape when I looked closer at the labelling.

Anyway, as expected I did not like the grape because the grape flavouring was really artificial, the grapefruit fared better however it was really vinegary.
The colour of the grapefruit was transparent light pink jelly.