What is magnaflux?

Answer One description: A process used to determine if a head is cracked. The head is magnatized using a powerful electromagnet, then iron filings are sprayed on the head to check for cracks. Patterns in the filings indicate either a cracked or normal head. This process works on cast iron heads but not on aluminum heads.

The answer given above is incorrect. Magnaflux is a product use to check for cracks and other discontinuities, but it has nothing to do with Magnetization. Magnaflux is a (3) part process using (a) Cleaner (b) Penetrant (c) Developer. The answer given above would be for the question, "What is Mag-particle Testing"?