Determining whether a shampoo is acidic or alkaline typically requires access to the product's information or performing a simple pH test. Here are two ways to identify the pH level of a shampoo:

1. Check Product Label or Manufacturer Information:Many manufacturers will provide the pH range of their shampoo on the packaging, label, or through their official website. Look for phrases like "pH-balanced," "low pH," or "optimized for hair health," which usually indicate a formulation close to the hair's natural acidity (around pH 4.5 to 5.5). Some brands might explicitly state the pH value. If this information is not readily available, you can contact the manufacturer's customer service for more details.
2. Perform a pH Test:If the pH information isn't provided, you can test the shampoo yourself using pH test strips or a pH meter. These are readily available online or at pharmacies.

• Using pH Test Strips: Take a small amount of shampoo and dilute it with distilled water. Dip a pH test strip into the solution and compare the color change to the chart provided with the test strips. The color will correspond to a pH value, allowing you to determine if the shampoo is acidic, neutral, or alkaline.
• Using a pH Meter: A digital pH meter is a more accurate tool. Rinse the meter's electrode with distilled water, then place it directly into a diluted shampoo solution. The meter will display the pH reading on its screen.

Keep in mind that a slightly acidic shampoo (pH 4.5 to 5.5) is generally considered optimal for maintaining hair health, as it helps to close the cuticle layers, enhancing shine and minimizing damage. Alkaline shampoos are usually above pH 7 and can be useful for deep cleaning or specific scalp treatments but might not be suitable for everyday use, especially for those with dry or damaged hair.