but ofcourse its lava -.-
My mistake: Tmp higher than 1 doesn't cause BMTL to rust, only to convert METL to BMTL. It also goes down until it reaches tmp 1, which makes it rust.
As a result, part of the METL is converted to BMTL, which has a tmp of 1, and rusts for that reason.
I already knew how lava's tmp works, but what I didn't know was that BMTL, when it has a tmp of 1 or more, rusts, and when it has a tmp of 2 or more, it converts nearby METL into BMTL, and gives said METL a tmp equal to the BMTL particle which converted it.
Through some testing I found it out: the answer is in BMTL's tmp setting. That lava has a ctype of BMTL, so it becomes BMTL when it cools down, which is normal. However, the lava also has a tmp of 100, which is the tmp BMTL will have once lava cools down.
wat no... ITS METAL add pressure to it... it wont break
It's okay. Fast change of temp, and it's broken. Just like you add some cold water to the hot glass jar, it breaks.
I hope the developers see this!