Demagnetization me aapko 2 chij karni hai. 1. Reduce 2. Reverse Reduce the current (through lower current, away part from coil or away coil from part) & Reverse the current. If possible, I will make a video on this topic
First magnetize part, then spread iron powder, When there is flux leckege, you will find indications and powder sticks. For more information, please refer below video: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-vKcrZEhZ3qk.html
Indication & Acceptance criteria ka video maine alag se video banaya hai, is lie is video me cover nhi kiya hai. Link for PT, MT acceptance criteria video : ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-Tk0q9ekQTSk.html