This one is utterly pointless. Feel free to skip it.
The Farscape Wiki has a summary here.
Thin liquid lava burns at many thousands of degrees. I very much doubt that anyone could come up with a substance that would enable someone to survive being immersed in a lava flow.
But at any rate: What exactly did we learn from this episode -- other than the obvious fact that it sucks to be encased in amber when you have the runs? Nothing -- and that is this episode's primary flaw. We've just added two brand new characters to the cast. Don't you think we should be spending a little more time getting to know Noranti and Sikozu and a little less time churning out these boring - and, in this case, scatological - action plots?
Okay -- I know you guys like the potty humor, but you can't build a whole story around it.
The acting's all right, though it's clear the cast had a hard time rising above the bad writing.
There's nothing to see here. Again, I recommend moving on.