Formative Ultralight is a small potion of condensed light energy in a semi-solid form.
One vial of Formative Ultralight contains enough to create a small item, no larger (in mass) than a dagger.
When it is opened and poured out, it begins to solidify into a hard white-grey mass within a minute.
It can be shaped during this time and adheres to nothing.
It has negligible weight, even when solid.
Once its form has been solidified, it lasts for any duration from one hour up to one day (decided by the crafter), after which it degrades into a weightless dust.