Short answer: It helps but it is not conclusive, because magnets stick to iron and steel but not to copper, brass or aluminium, while some stainless steels are weakly magnetic or not magnetic at all and some plated items can mislead, so a magnet is a good first check that should be combined with weight, colour and, if you are unsure, the opinion of the buyer.
Want real numbers? Compare current offers from verified buyers.
List Free →What the test is good for
A magnet quickly separates ferrous metals such as steel and iron from non-ferrous ones such as copper, aluminium and brass, which is the most useful first sort.
Where it can mislead
Many stainless steels are non-magnetic or only weakly magnetic, and a thin coating can hide the metal underneath, so a failed magnet test does not prove an item is aluminium or copper.
How to be more certain
Combine the magnet with weight and colour, scratch a hidden spot to see the metal, and ask the buyer when it matters.
How ScrapTrade Fits In
ScrapTrade buyers can identify an item from your photos and description when you are not sure what it is.
Facts beat folklore when you sell. ScrapTrade shows current prices and connects you with verified buyers, transparent weighing and escrow-protected payments.
List or Find Scrap on ScrapTrade →