Metallic salts


International labelling laws do not always require full disclosure of all ingredients. Slow color products used daily like color shampoos, and products made and produced outside the US can often legally contain hidden ingredients such as PPD’s, analine dyes, and metallic salts.

If you have used products containing metallic salts, it is critically important that you do not use Hairprint. Once the hair, containing metallic salts, has been cut off you can apply Hairprint to the new growth. 

Henna or the active ingredient in henna, lawsone inermis, is a known mutagen. Indigo comes in many forms/variations. It can be chemically processed and extracted, making it highly dangerous and possibly poisonous at the worst, and at best it can cause acute dermatitis.  Based on where the Indigo is sourced and what kind it is we suggest caution when using compound henna. The best type of henna is Body Art Quality, meaning safe for external use on the skin and scalp. If the ingredients in the henna product you used were: pure henna/lawsone inermis and/or Indigofera Tinctoria/Indigo ONLY, then it is safe to use Hairprint Color Restorer on your hair. Henna may create dryness, due to the mud-like coating it places, on the hair that can remain for long after the effects have dissipated. 

Compound hennas can often legally contain hidden ingredients such as PPD’s, analine dyes, and metallic salts. If you are having allergic reactions to henna, you may have used what is known as a compound henna dye, or used a product that contained a type of Indigo that was not the safest version. 

The most dangerous of these ingredients are metallic salts, including; copper, silver nitrate, silver or bismuth, or lead. Metallic salt products can fade to strange colors. Those that contain lead turn purple. The dyes containing silver turn green, and those containing copper turn bright red. Metallic salts such as these can remain for 1-2 years long after results have faded. 

If you know what you have used on any hair that still remains, and was used in the past 1-2 years, you may ask the manufacturer of the products used, for a certified analysis of ingredients or an MDMS sheet. The only true way to know is to *test your hair for metallic salts. Should you wish to *test your hair please know that we can only provide the process. We here at Hairprint, cannot provide the ingredients needed to perform this test. We can only provide the test itself and how to determine what the results mean. Seeing, the possible results you will understand, why Hairprint Color Restorer and indeed no other product, should be used over metallic salts, until they have fully dissipated.  


*Test for metallic salts:

Harvest some of your hair. 

Mix one ounce (30 ml) of 20-volume peroxide and 20 drops of 28% ammonia.  

Put your harvested hair in the peroxide-ammonia mix.


If there's lead in the henna you've used, your hair will change color immediately.

If there's silver nitrate in the henna you've been using, there will be no change in hair color, because silver is coating the hair. However, silver nitrate leaves a greenish cast to your hair, so you can tell by that. 

If there's copper in the henna you've used, your hair will start to boil, the hair will be hot and smell horrible, and the hair will disintegrate.

If there is no reaction after 30 minutes, the hair contains silver or bismuth.

Hair that has no metallic salts on it should lighten only very slightly.


Regarding the ingredients needed to perform the test: you may purchase supplies at retail beauty supply (ask for developer products that contain 28% ammonia or 20% level peroxide), online retailers like Amazon may sell them, photography supply stores, or you may ask an expert stylist or professional to procure these ingredients or to help you perform this test. 

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