I dont know why, but alkaline soup expands and contracts Alot with changes in temp. so when you're using a vessel with a small neck that you fill with your nps and put a cap on, NEVER heat the vessel with cap sealed. on purpose or accidentally. if the jar is somewhere that may have a large rise in temp, dont fill it and cap it. it doesn't have to be too warm to touch before it explodes. this has happened to me twice. once sitting in front of a heater, and once in the sunlight. its not fun, and its extremely dangerous.

i suppose this applies to any vessel that is nearly full with or without a small neck. but air compresses, so if theres enough of it there, i suppose its a little less likely to explode.

Good note. If one is going to seal the lid while heating a mix, at the very least be mindful and occasionally "burp" the vessel. Generally it may be best to loosely cap the vessel.

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and contain it in a larger stainless pot. so if it does break, you just lose the jar.

I stand my vessels in a sink of hot water. As the water cools I just let it out and top it up with hot again. After a few fills the soup almost is the same temp as my hot tap.

The sink and draining board is a good place for everything extraction. Stainless steel surfaces, easy access to water which is also good for cooling and heating, good lighting and ventilation, safe drainage in case of emergency.

My hot water heater isn't that awesome

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We don't need that much heat to get a good extraction temp after it's cooked and based. Standard 50-60C hot tap water temp works fine. I mucked around floating bottles like in Cybs, heating elements and other stuff too. It does no better that plain hot tap water IME.

agreed, both of my uncle bobs accidents happened while simply trying to go from a little chilly, to slightly above room temp. you know, naphtha..

it isnt the temp im referring to, rather the temp differential.

I could say I was referring to bathing cats at this stage as well, but I wasn't.

Though I suspect the temperature differential being the cause of your breakage is close to the truth but not in the way you think. When you use radiation as a heat source the closest point will develop a hot spot.

Hopefully someone comes up with an easy workable solution so you don't get a big mess again.

well the reality of that is that i need to be more attentive. i was aware of the potential, but multitasking, and leaving the lesson up to weather or not it happened. but your assesment is prolly the part i didnt consider. black sludge inside sealed glass container, direct sunlight, duh!

This method works great with a skinny vessel.
The temp never waivers at all so no worries about explosions from my experience.

https://www.dmt-nexus.me...mp;m=1046825#post1046825