Microblading is a kind of tattooing but the two are very different. Regular tattooing ink cannot be used for microblading. Special pigments are used for microblading. The lifespan of microblading and the colour of the hair strokes depend on the quality of the pigments. Visit https://www.marcia.co.uk/pmu/microblading/ for detailed information on microblading. The ink for microblading is mainly of two types, organic and inorganic.
The pigments used to make this ink are called lake pigments. Fruit and vegetable extracts are used to create organic ink. This ink gives bright and bold colour to the brows. It naturally blends with the skin. There is very little clumping because organic ink is oil dispersible. But exposure to sunlight for extended hours can fade the organic pigments. So make sure to apply sunscreen or use shades.
Organic pigments are safe and healthy as they are made from natural materials. Microblading with organic ink can reliably give long lasting results. Since there is no use of hard industrial materials, the risk of allergic reaction is less. However if you are allergic to any ingredient of the ink then in rare cases you can have an allergic reaction from microblading.
The main ingredient of inorganic ink is iron oxide. Use of iron oxide in foods and traditional cosmetics is approved by FDA. It is easier to get brown shade brows by using iron oxide. Iron oxide is inexpensive and non-toxic so it is an ideal ink ingredient. But there can also be other preservatives and perfumes in inorganic ink. Sometimes zinc oxide is combined with iron oxide to give a more solid colour. Cheap inorganic ink can have more heavy metals and toxic chemicals in it.
Inorganic ink can cause severe allergic reactions. If it is not properly applied then there is a risk of permanent damage. Use of inferior materials in ink can have adverse effects on your health. Moreover, ink with high iron content is likely to change colour over time. You should consider the pros and cons to choose the right ink.