There are several alchemical texts that refer to tin salt as fuel for "ever-burners" or lamps that always stay lit, although it was proven that these lamps only light when they come in contact with air, so that when a door is opened, the lamp lights at once, giving the illusion that it's been lit ever since it was placed there. So in conclusion, tin salt, if extracted correctly, should in fact, burn when in contact with air.
Here is one text that gives a wonderful explanation of this:
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Phosphorus is an element that can burn when exposed to air, producing a bright flame and white smoke.
Several do. The most common of them is phosphorus, but rubidium and cesium also burn on contact to air.
Phosphorus is the element that ignites spontaneously in air due to its high reactivity. When exposed to oxygen, phosphorus can catch fire and burn brightly, producing light, hence the nickname "light-bearer."
When an element burns in air, it reacts with oxygen to form a compound known as an oxide. The specific oxide formed depends on the element being burned. For example, when carbon burns, it forms carbon dioxide (CO2) and when magnesium burns, it forms magnesium oxide (MgO).
Magnesium burns in air and nitrogen to form magnesium oxide (MgO) and magnesium nitride (Mg3N2), respectively.
One chemical property of hydrogen is its ability to react with oxygen to form water. Hydrogen also exhibits the property of being highly flammable when exposed to air or an oxygen-containing atmosphere.
Phosphorus is an element that emits a distinct garlic-like odor when it burns.