What is a keg of nutrients for?

Lerad

Item:

"keg57200"                              a keg of liquid nutrients

By far the most noticeable feature of this sizable keg is the horrendous smell that surrounds it.
The pungent odour that emanates from its contents is reminiscent of the rotting remains of dead fish
or old eggs. The sides of the keg have been fashioned from durable wood but contains stains from its
contents regardless. The fluid inside is of a sickly yellow colour, containing solid bits and pieces
that appear to once have belonged to various types of sea-animal.
It has 107 months of usefulness left.
It weighs about 40 pounds.

What tradeskill makes it, what is it for?

Kaimanahi

It's from the Cooking Constructs skill. It increases the health of colossi.

Maligorn

I'm pretty sure this is the Cooking item for aether ring colossi, but I could be wrong.

EDIT: -shakefist Kelly-

Lerad

Ahh, the thing that is listed as slurry in the help constructs file. Thanks.