The Jar generator can make these jars, as well as Butterfly jars . Elnock will also give you five Impling jars if you ask for it.
To make one yourself, you will need a flower (either a farming flower or a flower from Mithril seeds ), Butterfly jar , 8 cooked Anchovies, a Pestle and mortar, an empty Vial and a Sieve (obtainable from the Chemist in Rimmington ). Use the cooked Anchovies with the Pestle and mortar to get a thick paste. Next, use the thick paste with a Sieve to extract some oil into the Vial . Use the flowers on the Vial . Lastly use the vial of anchovy oil and a Butterfly jar on the lamp oil still to convert it into an impling jar.