* Shampoo pH: The color change of universal indicator depends on the pH of the solution. Shampoo can have a wide range of pH values, from slightly acidic to slightly alkaline.
* Shampoo Ingredients: The ingredients in shampoo can influence its pH, and therefore its effect on universal indicator. Some common ingredients include:
* Surfactants: These cleanse the hair and can be acidic or alkaline.
* Acids: Citric acid and lactic acid are often used to adjust pH and improve conditioning.
* Alkalis: Sodium hydroxide (lye) can be used to adjust pH and increase cleaning power.
To determine the color change, you would need to:
1. Test the pH of the shampoo. You can use pH paper or a pH meter.
2. Refer to a universal indicator chart. This chart shows the color of universal indicator at different pH levels.
In general:
* Acidic shampoos (pH below 7): Universal indicator will likely turn red, orange, or yellow.
* Neutral shampoos (pH around 7): Universal indicator will likely turn green.
* Alkaline shampoos (pH above 7): Universal indicator will likely turn blue, indigo, or violet.
Important Note: Don't use universal indicator on your hair. It is a chemical solution and could irritate your scalp.