Metallic salts


International labelling laws do not always require full disclosure of all ingredients. Slow hair color changing dyes and even supposedly natural products that provide slow color changes tot he hair over time often contain ingredients that can have dangerous interactions and consequences. These can be found in a wide array of products including but not limited to: color shampoos, hair sprays or hair/scalp treatments, creams, dyes, hennas, and compound hennas. These can and often do contain metallic salts. Products made and produced outside the USA, can often legally contain hidden ingredients such as: PPD’s, analine or coal tar dyes, and/or metallic salts. 

If you have used products containing certain dangerous 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 any henna that also contains Indigo. 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 creates dryness due to the mud-like coating it places on the hair that can remain for long after the effects have dissipated for 1-2 years.

Compound Dye Forms: Hennas & other Coloring Products (shampoos, creams, glosses or glazes)

Metallic salts: Some are benign and and some are extremely dangerous and cause extreme harm to hair if they interact with certain substances that on their own would not cause this effect. The most dangerous of these metallic salts are: copper, silver nitrate, silver, bismuth, or lead. Effects of: 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. 

Warning: For your hair, scalp, and body safety if any product you have used still remains within the hair, meaning it could have been used in the past 1-2 years, please avoid using Hairprint Color Restorer over any of this hair.

How to Determine if the product(s) you have used contains these dangerous metallic salts:

If you are having allergic reactions, strange color fading, or harsh interactions with other forms of color treatments, you may have used what is known as a compound henna dye or a metallic salt based dye.

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 the dangerous 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 help 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 from the hair or the hair has been cut off.  


*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.

The adverse effects of chronic exposure to silver are a permanent bluish-gray discoloration of the skin (argyria) or eyes (argyrosis). Most studies discuss cases of argyria and argyrosis that have resulted primarily from exposure to the soluble forms of silver (soluble means anything that can be rinsed off with water which is the class; hair care products)  Besides argyria and argyrosis, exposure to soluble silver compounds may produce other toxic effects, including liver and kidney damage, irritation of the eyes, skin, respiratory, and intestinal tract, and changes in blood cells.

Hair that has no dangerous metallic salts in it, such as the ones listed above, should lighten only very slightly.


Possible options to procure the ingredients needed to perform the test: It is possible that you may be able to 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. Because we here at Hairprint don't make provide or support the use of these high level caustic chemicals we cannot provide information on where or how to procure them. Your safety is our #1 priority. Please take all precautions to ensure the safety of your hair before using Hairprint Color Restorer when any known metallic salts may be present. 

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