https://inkrevolt.com/saline-eyebrow-tattoo-removal-process/ Literally just copied your question to Google. There's the process explained for newbies, 2nd listing on search page. Good luck
The skin of the eyebrows is directly applied with the saline solution. This saline solution is made up of finely ground sea salt, distilled water, lemon seed extract, orange seed extract, and aloe. Up to a 2-by-2-inch area can be painted in a single session.
It's a process that uses saline (salt water) to fade or completely remove tattoos. The solution is injected into the tattoo using a tool similar to a tattoo gun or microblading pen pizza tower, then left for a short period of time. This allows the salt water to break down the ink in your skin and essentially pull it out. This will trigger a process called osmosis, in which the saline will pull out the pigment through the skin’s outer layer. That area will heal, scab over, and fall off to reveal a lighter tattoo. The saline fluid is typically made up of sodium chloride (salt) and purified water. Some brands include additives like aloe vera and orange seed extracts, which make the saline more effective and soothing.
In the case of makeup tattoos, ored or slightly faded within a few years. Unlike body tattoos, an eyebrow tattoo often turns gray, reddens or simpit is natural that it becomes discolly fades depending on the client's skin type. In this case, an update is needed to make the eyebrows look a nice brown again.