Index CI XXXXXX:1
In addition to the usual five-digit CI numbers, you can also find a six-digit number in ink formulations, where the last digit (usually '1') is written through a colon (:1). This isomer is the same substance, identical in atomic composition and molecular weight, but differing in the structure of atoms and, as a result, in properties.
What is it done for?
It's simple—to circumvent the law.
For example, in country N, the colorant CI XXXXX is prohibited at the legislative level. The pigment manufacturer changes one atom in the specified substance, writes new documentation, registers it under a new number, adding “:1” at the end, and that’s it—the new substance CI XXXXX:1 differs in structure from the prohibited one, is not included in the list of prohibited substances. You can produce ink with it, you can use it, sell it to PMU artists.
But questions immediately come to mindю.
Is it legal at all?
Yes, it is. And very smart.
Will the isomer be banned over time?
Maybe. It's a matter of time. In each country, the regulation of the production of tattoo and PMU inks differs significantly.
If it's an isomer of a banned substance, does that mean it's potentially dangerous/toxic?
No. Manufacturers are not stupid people and understand what substances can really harm a person, and do not use them.
If CI 11111 is banned in country N, this does not mean that it will also be banned in country M. The legislation of different countries works differently, so new bans are often controversial. The well-known colorants, which have not harmed a single person in years, fall victim to the heat of the moment. It is such situations where isomers are used.
And a little more about the properties that apply to the work of PMU artists: although the properties will differ, they are so insignificant that you simply won’t notice them. Ink with such a pigment in the composition is implanted in the same way as with the original pigment. It is removed by the laser in the same way as the original one. It degrades in the skin the same as the original pigment.
Do not be afraid to use it.