PCB etching solution ferric chloride is mainly made through the following steps:
1. Prepare 500-600 grams of ferric chloride, 20-50 grams of hydrochloric acid, and 1000 grams of water.
2. Mix ferric chloride and hydrochloric acid in a certain proportion, dilute with water, and stir evenly.
3. Heat the mixture to 40-50 degrees and keep stirring at this temperature for 5-10 minutes.
4. The prepared ferric chloride etching solution can be used repeatedly.
The above information is for reference only. It is recommended to consult professionals for specific information.