A big bundle of this colour emerged recently in a clean up - Moretti 090. Some websites refer to this as "Kelp" - but the original packaging refers to it as (in Italian) Verde Algae. Algae Green I can just about buy - but I've lived on the west coast - and my first thought was: "Kelp this ain't!" Kelp is a truly amazing plant - it can grow a couple of feet a day - but it tends to be more of an iridescent brown when it washes up on the beach.
However, a quick trip to Wikipedia on the topic of kelp, reveals that kelp used to be burned in quantity to produce the soda ash used in soda glass production - so there may be a connection that way. I just thought it was a faulty translation!
Anyhoo - it's a colour that could spark arguments about whether is it more of a dirty yellow, or a very light green. It's a very organic colour - a little too green to be a real yellow, IMHO, and not really green enough to be a green. In the second pic - the two beads have trace bits of white, for a slightly cloudy effect. Upon even further contemplation - you could call it a light gold colour. Which brings us to our third picture!
This encased silver foil bead is Mor. Rose Quartz on the left (notice there is hardly any yellowing of the foil!!!!) and on the right, that rich golden brown, that's Kelp over silver foil! How'd ya like that! What a great colour! I'm really impressed with that! If nothing else - you're going to want to experiment with this for other cool reactions!