Himalayan pink salt derives its distinctive colour primarily from iron oxide (rust) and trace minerals like magnesium, which react during its formation. Here’s a breakdown of the science behind its hue:

Key Factors in Colouring

1. Iron Oxide: The dominant contributor to its pink colour, iron oxide forms when iron in the salt reacts with oxygen over millions of years. This process mirrors the oxidation that causes rust.

2. Magnesium: While iron oxide produces a reddish tint, magnesium may subtly influence the salt’s pinkish undertone.

3. Trace Minerals: Though Himalayan salt contains ~84 trace minerals (e.g., calcium, zinc), their quantities are too small to significantly alter its colour.

Iron Oxide: This is the main culprit responsible for the reddish-pink hue. As the salt crystals form over millions of years in the underground deposits, the iron present in the salt reacts with oxygen, creating iron oxide. The more iron oxide present, the deeper the pink or even reddish colour of the salt.  

Other trace minerals: While iron oxide is the most significant contributor, other minerals present in trace amounts can also influence the varying shades of pink. These can include:

• Calcium

• Magnesium

• Potassium

• Copper

• Zinc

Formation and Mining

The salt formed ~800 million years ago from evaporated seawater, later compressed and shielded by lava layers in Pakistan’s Salt Range. It is mined using the room and pillar method, preserving its natural mineral composition.

Debunking Health Claims

While the pink colour is often marketed as a sign of purity or health benefits, the iron oxide and trace minerals are present in trace amounts (about 3% of total composition). No scientific evidence supports that the colour enhances nutritional value.

In summary, Himalayan salt’s pink colour stems from geological oxidation processes, not unique health properties.

The pink colour of Himalayan salt comes from trace minerals, primarily iron oxide (rust). When iron reacts with oxygen, it gives the salt its distinct pink, orange, or reddish hue. Additionally, other minerals like magnesium, potassium, and calcium contribute to the subtle variations in colour.

Since Himalayan salt is minimally processed and unrefined, these natural minerals remain intact, unlike regular table salt, which is typically stripped of its minerals. The more iron present in the salt, the deeper its pink or reddish shade.