How to Identify Different Metals Before You Sell: A Visual and Magnet Test Guide
Most people leave money on the table not because they have bad scrap — but because they don't know what they have. Throwing copper, aluminum, and steel into the same bin and calling it "mixed metal" is one of the most expensive mistakes a scrapper can make. Sorted loads fetch better prices. Period. Before you list anything on a scrap metal auction or call a yard, take ten minutes and learn what you're actually holding.
This guide walks you through the practical, hands-on methods yards and buyers use every day. No lab equipment. No guesswork. Just your eyes, a magnet, and a basic understanding of what different metals look, feel, and behave like. Whether you're clearing out a garage in Montreal or processing a truckload from a demolition job in Quebec, sorting your metals correctly is the single fastest way to improve what you get paid.
Why Sorting Metals Before a Scrap Metal Auction Actually Matters
When a buyer bids on your load — whether through a platform like Canada's B2B scrap recycling marketplace or a local yard — they're pricing based on what they can resell. A clean, sorted load of copper wire is worth significantly more per pound than a bin of mixed copper, wire, and steel fittings. Buyers discount heavily for uncertainty. They have to. They're pricing in the sorting labour, the contamination risk, and the time it takes to process what you sent them.
Documented, sorted inventory also gives buyers more confidence when bidding. More confidence means more competitive bids. More competitive bids means better price discovery for you. That's not theory — that's how competitive auctions work. Platforms like SMASH are built around this logic: get your inventory right, and competition does the rest.
Start Here: The Magnet Test (Your Most Reliable First Step)
Before you look at anything else, grab a strong magnet — a rare earth magnet if you have one, but a fridge magnet in a pinch. This test alone separates the majority of scrap into two major categories instantly.
Magnetic = ferrous metal. Steel and iron will stick. These are your lower-value metals by weight — structural steel, rebar, cast iron, sheet metal. They're still worth selling, but they're priced differently than non-ferrous metals like copper, aluminum, and brass.
Non-magnetic = likely non-ferrous. If your magnet doesn't stick, you're probably looking at something more valuable: copper, aluminum, brass, stainless steel (in some grades), lead, or zinc. Non-ferrous metals are the ones that move the needle on price per pound.
A few important caveats:
- Some stainless steel grades are weakly magnetic — don't write off stainless just because a magnet barely catches it.
- Aluminum and copper are never magnetic. If your magnet sticks to something that looks like copper pipe, it's plated or contaminated.
- Lead is very heavy and dull grey — it won't attract a magnet at all, and it bends easily under pressure.
Visual Identification: What Each Metal Actually Looks Like
Once you've sorted magnetic from non-magnetic, visual cues get you the rest of the way. Here's what to look for with the most common scrap metals you'll encounter in a residential cleanout, demolition project, or industrial job in Montreal or anywhere across Quebec.
Copper
Fresh copper is a warm reddish-orange — unmistakable when clean. Aged copper turns green (patina) or dark brown. You'll find it in plumbing pipe, electrical wire, motor windings, and heat exchangers. Scrap copper is one of the most valuable metals by weight you'll pull from a building. Strip your wire where possible — bare bright copper fetches considerably more than insulated wire. Check the explore Canadian scrap metal guides for up-to-date copper pricing breakdowns.
Aluminum
Aluminum is lightweight, silver-grey, and doesn't rust (though it does oxidize to a dull white coating). It's not magnetic. You'll find it in window frames, gutters, car rims, engine blocks, extrusions, and siding. Scrap aluminum comes in several grades — cast aluminum (thicker, engine parts), extrusion aluminum (window frames, ladder rails), and sheet aluminum each carry different prices. Don't mix them if you can help it. Weight alone doesn't tell the story — grade does.
Steel and Iron
Steel is magnetic, grey to silver in colour, and tends to rust orange-red. It's heavy. Cast iron is darker, more brittle, and often found in old radiators, engine blocks, and pipe fittings. Structural steel — beams, angle iron, rebar — is your standard #1 or #2 steel at the yard. The steel scrap price today fluctuates with global demand, but sorted clean steel always beats mixed or contaminated loads.
Brass
Brass is a yellow-gold metal — not as red-orange as copper, more yellow. It's non-magnetic and heavier than aluminum. You'll find it in plumbing fittings, valves, door hardware, and shell casings. It scratches to reveal a consistent yellow-gold colour underneath any surface tarnish. Brass is worth pulling and sorting separately — don't let it get buried in your mixed metals bin.
Stainless Steel
Stainless is silver and polished-looking. Weakly magnetic in some grades, non-magnetic in others. The easiest test: stainless won't rust. Leave a piece outside for a week — if it stays shiny, it's stainless. You'll find it in kitchen equipment, hospital furniture, industrial tanks, and automotive exhaust parts. It prices differently than regular steel, so keep it separate.
Lead
Lead is heavy — disproportionately so for its size. It's dull grey and bends easily with hand pressure. Not magnetic. You'll find it in old pipe, wheel weights, battery plates, and roofing flashing. Handle it carefully and know your local regulations — lead requires proper handling and documentation in most Canadian jurisdictions.
Quick Field Tests Beyond the Magnet
When visual ID and the magnet test leave you uncertain, a few additional field checks help narrow things down without any equipment beyond what you likely already have.
- Weight test: Aluminum is light. Lead is shockingly heavy. Copper sits in between. If something seems too heavy for its size, think lead or cast iron. Too light, think aluminum.
- Scratch test: Scratch a small, inconspicuous area. Brass scratches to yellow-gold underneath. Copper scratches to reddish-orange. Painted steel reveals a grey metallic surface.
- Bend test: Lead bends easily by hand. Aluminum bends with moderate effort. Steel resists bending. This helps distinguish lead from grey-painted aluminum quickly.
- Sound test: Drop the piece on concrete. Steel rings. Cast iron gives a dull thud. Aluminum produces a softer, flatter sound than steel.
- Rust check: Rust means ferrous (iron or steel). Non-ferrous metals don't rust — they oxidize differently (copper goes green, aluminum goes white-powdery).
Run through these in order and you'll correctly identify 90%+ of common scrap metals before your load ever hits the scale. When you're ready to sell your scrap metal in Canada on SellYourScrap, you'll show up with sorted, documented inventory instead of a mixed bin that costs you on every pound.
How Proper Metal ID Connects to Better Prices in Quebec and Across Canada
Here's where this gets real. A buyer looking at your load through a scrap metal auction on SMASH isn't guessing — they're pricing what they can verify. If you've sorted your copper from your brass, your clean aluminum from your painted extrusion, and your stainless from your mild steel, you've already done the work that buyers typically have to discount for.
Yards in Montreal and across Quebec see mixed loads constantly. Sorted loads stand out — and buyers compete harder for them because the risk is lower. That's the core logic behind auction-based pricing: competition reveals what the market will actually pay, but only if your load is documented and sorted well enough for buyers to bid confidently.
Platforms like SMASH build photo documentation, serial tracking, and inventory tools directly into the selling process. That structure exists precisely because documented loads attract better bids. If you're pulling significant volumes from a demolition or industrial cleanout, those tools matter. For smaller residential loads, the same principle applies — sort it, document it, and let buyers compete. You can access Montreal scrap metal services that connect you directly with vetted buyers and fair market pricing.
There are no subscription fees on SMASH. No upfront costs. The model only works when sellers win — which keeps the incentives aligned in a way a single-buyer phone call never can. If you're trying to find the best scrap metal prices Quebec has to offer, the answer isn't calling one yard and accepting their number. It's putting your sorted, documented load in front of multiple vetted buyers and letting the market speak.
Ready to stop guessing and start getting paid what your scrap is actually worth? Get a fair price for your scrap today — sorted loads move faster and bid higher. Request a pickup at sellyourscrap.ca and put competition to work for you.
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Frequently Asked Questions
Q: How do I tell the difference between copper and brass scrap?
Copper is a distinct reddish-orange colour, even when aged. Brass is more yellow-gold. Scratch a small area on both — copper reveals orange underneath, brass reveals yellow. Neither is magnetic, so the magnet test won't separate them. Weight is similar, so colour and scratch test are your best tools here.
Q: Does sorting my metals really affect my scrap metal auction price?
Yes — significantly. Sorted loads reduce risk for buyers, which means they bid more aggressively. Mixed or contaminated loads get discounted because buyers price in the cost of sorting. A clean load of bare bright copper, for example, will consistently fetch more per pound than the same copper mixed with insulated wire and fittings.
Q: Where can I sell scrap metal online in Montreal or Quebec?
Platforms like SMASH connect sellers with vetted buyers across Canada through a competitive auction format. For residential or smaller loads in Montreal, sellyourscrap.ca offers pickup service and fair market pricing. Sorting your metals before you sell — regardless of which channel you use — always improves your outcome.
Q: Is aluminum scrap worth selling in Canada in 2026?
Aluminum remains one of the most actively traded non-ferrous metals in Canada. Prices fluctuate with global demand and alloy grade, so check current rates before you sell. Clean, sorted aluminum — especially extrusion and cast — fetches better per-pound rates than mixed or painted material. Always separate your grades where possible.
Q: How accurate is the magnet test for identifying scrap metals?
The magnet test is highly reliable as a first-pass sort. It cleanly separates ferrous metals (steel, iron) from non-ferrous metals (copper, aluminum, brass, lead). Its limitation is within the non-ferrous category — you'll need visual ID, weight, and scratch tests to distinguish copper from brass or aluminum from lead. Use the magnet test first, then follow up with visual checks.
Disclaimer: Scrap metal prices fluctuate daily based on market conditions, grade, and regional demand. Prices referenced in this article are general guidance only. Always check current rates before selling.