Help! > Mistakes, muckups, and dangerous behaviour

Small broken taps blind hole fix easy

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crueby:

--- Quote from: mcostello on August 15, 2024, 03:56:49 PM ---There are at least 4 different kinds of alum. Make sure You get the right kind.
I left an aluminum part on the wood stove for a couple of days till i found it out.

--- End quote ---
Ah, that would explain why the one time I tried it, it didn't work!  As Per asked, how do we find the right version??

gipetto:
from wikipedia

Alum in the form of potassium aluminium sulphate or ammonium aluminium sulfate in a concentrated bath of hot water is regularly used by jewelers and machinists to dissolve hardened steel drill bits that have broken off in items made of aluminum, copper, brass, gold (any karat), silver (both sterling and fine) and stainless steel. This is because alum does not react chemically to any significant degree with any of these metals, but will corrode carbon steel. When heat is applied to an alum mixture holding a piece of work that has a drill bit stuck in it, if the lost bit is small enough, it can sometimes be dissolved / removed within hours.[33]

that's all it says, the rest is about other uses such as antiperspirant.

Potassium alum, potash alum, or potassium aluminium sulfate is a chemical compound first found mentioned under various Sanskrit names in Ayurvedic medicinal texts such as Charak Samhita, Sushrut Samhita, and Ashtang Hridaya; is chemically defined as the double sulfate of potassium and aluminium, with chemical formula KAl(SO4)2

Ammonium aluminium sulfate (NH4)Al(SO4)2

crueby:
But what do they call it in the stores?

Jo:
People from India use it a lot and they call it Fatakdi Powder, we call it Alum Powder, either way it is crystallized potassium aluminum sulfate and you find it on Ebay or in the Eastern food stores.

Jo

bent:
...exactly what kind of food would use that?

Never mind, don't want to know.  I'll ask my #2 son, he's back home from travelling the world, including the middle East.

Having #2 son home this summer, we have explored a variety of ways to cook wild rabbit (Mom gave us permission to go full Ukrainian on the Rabbit Invaders of her garden), and agree the Maltese recipes are some of the best.  Pressure cooker is also top of our list.

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