Contest: Hot slingshot in liquid

Hot slingshot in liquid Make slingshot by bending the stainless steel rod

update by Dankung Nov. 13, 2019
Thank Marksman for posting that interesting video.
A Question and Win is made based this vidoe.
Question: what is the liquid? why is the slingshot put into tht liquid and the What are the benefits of doing that?
Rule: Comment below to answer above questions. The first one answers the question correctly and well wins 10 meters 2019 new premium band.

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