Henna dyes and metallic dyes are bad both ways. They can interact with other chemicals to create colors with an odd greenish/orange cast and/or damage to the point of needing to be cut off. I do not recommend henna dyes, do some internet research...you'll probably find some of what I'm talking about. -------------- Metallic dyes and henna dyes (which usually contain metallic dyes) cannot be removed from the hair. Once you have used a metallic dye, no other chemicals can be used on the hair. The only way to remove the color is to cut off the treated hair. Using other chemicals on hair treated with metallic dyes can cause negative chemical reactions that may include irreversable damage and breakage, uncorrectable unusual color changes, and even chemical burns. One of the tell-tale signs hair has been treated with a metallic dye is when any ammonia-based hair color product or bleach is applied, the hair begins to emit a strong foul odor and smoke may be seen rising from the hair. If this occurs, rinse immediately to prevent chemical burns on the scalp and minimize damage to the hair.
buggie bugs.
No
Chemical elements are combined to produce chemical compounds.
No
When a plant is mutated it's genetic make up is modified. It might able to fight off plant disease like rust, but it might produce harmful chemical toxins or might have a high concentration of a harmful chemicals. Thus people are hesitant to try the new genetically modified plants and crops. Ultimately they might also cause ecological imbalance.
No, it uses chemical energy (in the fuel) to produce mechanical energy
Yes.
Melanin is the dark pigmentation contained in skin. It is contained in melanocytes, which are the cells which produce melanin. The purpose of melanin is to filter out harmful radiation from the sun. Mostly it does not. The best way is to use a sunscreen with SPF of 30 or more.
Antibodies attack proteins. If the organism starts to produce antibodies against the essencial proteins in metabolism (as seen in autoimune disease) it can lead to death
After a chemical change new molecules are obtained.
Animals that produce poison.
It is possible for curing concrete to produce VOCs, or volatile organic compounds, which contain harmful gases. This can happen if the concrete is cured using a toxic chemical compound. The toxicity of the gas has shown to wear off after 28 days.