Determination of pH in textile and leather products is important in evaluating whether the products are comfortable and safe for the user. pH determines the acidic or basic character of a material. The pH value of textiles and leather products that come into direct contact with the skin should be close to the natural pH value of the skin (usually between 4.5 and 6.5), otherwise it may cause skin irritation.

Common steps for pH determination in textiles and leather products are:

1. **Sample Preparation:** A sample of appropriate size is taken from the textile or leather material to be tested.

2. **Extraction:** The sample is extracted by keeping it in water or a specific salt solution (usually potassium chloride) for a while. This extraction allows the free acids or bases in the material to pass into the liquid.

3. **pH Measurement:** The pH of the extract is measured with a calibrated pH meter.

4. **Evaluation of Results:** The obtained pH value is evaluated according to the relevant standards or specifications.

ISO, EN or other national standards bodies have published specific methods and protocols for pH determination of textiles and leather products. If you wish to obtain specific protocols and details for this type of analysis, you will need to review the full text of the relevant standard. For example, standards such as "ISO 3071:2006 - Textile - Determination of pH" can be used in this regard. You can also refer to different standards depending on the geography or industry you apply to.