Reply to Thread

Message:: [QUOTE="desertgem, post: 3800841, member: 15199"]When the magnet test was first used to separate coin metals, they were the old fashion magnets. Now there are rare earth composite magnets that are much much stronger than the old ALNICO horseshoe or bar magnet commonly used. The current magnets ( I suspect the magnet pictured above is a neodymium as they tend to be encased due to rapid oxidation). Most Alnico seem to 100+ times weaker of similar size Neos. I would be hesitant using a Neodymium as a test to send off. Better to have a XRF test. You might try separating the coins from the magnet with different thicknesses of books or pages to see if still similarity of attraction.Small amounts of difference with such a strong magnet could be from contaminants. IMO, Jim Neodymium labelsGrade GaussN35 11,700-12,100N38 12,100-12,500N40 12,600-12,900N42 12,900-13,200N45 13,500-13,800N48 14,000-14,200N50 14,300-14,500N52 14,600-14,800[/QUOTE]