Iron oxide is a basic oxide that does not react with salt.

Basic oxides refer to oxides that dissolve in water to form alkalis or react with acids to form salts and water. Alkaline oxides are metal oxides, and their alkalinity varies greatly. Some (such as sodium, calcium, and magnesium oxides) are easily hydrated and can quickly and completely neutralize all acidic substances. The heavy metal oxides only appear weakly alkaline, hardly soluble in water, have no effect on the water, and can only neutralize with stronger acidic substances. There is a transition from basic oxides to acidic oxides, that is, some amphoteric oxides (such as alumina) are both acidic and basic.

Basic oxides include active metal oxides and base oxides of other metals, such as sodium oxide, calcium oxide, barium oxide, and chromium monoxide. The corresponding hydrates of basic oxides are bases. For example, the hydrate corresponding to calcium oxide is calcium hydroxide, and the hydrate corresponding to sodium oxide is sodium hydroxide.

But insoluble alkaline oxides do not react with water, such as copper oxide does not react with water.

Alkali metals such as sodium, potassium, etc., as well as calcium and barium oxides, can react with water to form corresponding hydroxides.

Most inorganic salt products can be dyed with iron oxide pigments without any reaction or influence. You can use it with confidence.

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