Metal identifier by photo

The metal identifier compares a metal piece or found relic with copper, brass, bronze, silver, gold, aluminum, iron and steel, lead, zinc and pewter. Upload one to three photos of the same piece: the whole piece beside a coin, a close view of a worn or clean spot, and a sharp close-up of any marks. Then choose where it is from: a metal detecting find, a household item, scrap or workshop, or not sure.

The result lists possible material groups, the visible clues behind them, and alternatives the photographs cannot separate. It also explains what remains unknown and offers a follow-up question. Existing notes about the object or a previously observed magnet response may help, but the tool treats them as unverified context rather than properties measured from the image.

The metal identifier works in a set order: metal or not, the color of clean or worn metal, the corrosion color, the form, and last any marks and stamps. Paint, plating and corrosion can hide the base metal, so a worn spot often says more than a shiny face.

An already exposed area can show a different appearance from paint, plating or corrosion. Reddish tones may support copper-rich material, while yellow or brown tones can support several copper-alloy comparisons. Silvery surfaces have many possible compositions. The Canadian Conservation Institute provides examples, but photographs do not measure the elements present or reveal every underlying layer.

Aluminum, zinc, tin, lead, silver and steels can overlap in gray appearance. A polished surface may reflect the room rather than its own color. Rust-like areas can support an iron-containing comparison, but the absence of rust does not identify stainless steel. Photograph existing wear and any full mark in neutral light; do not clean or scratch a new patch for the tool.

Corrosion patterns add context, especially when an object has several exposed areas. Copper-containing materials can develop green, blue-green, brown or dark products. Brass and bronze often remain difficult to distinguish visually. A green spot may belong to a coating, solder or adjacent component, so show where it sits on the complete object before assigning a material group.

Orange-brown layers may support rust, while white or dark crusts occur on several metals. The photograph cannot establish the chemistry of a powder or whether it is safe to handle. Record color and texture separately from the proposed material. Thick corrosion can conceal the evidence needed for an answer, and an unresolved result is appropriate when the substrate is hidden.

A naturally worn high point can expose a contrasting layer, but the color boundary may also be a repair, solder, paint or a separate fitting. Describe the location and compare another view before proposing plating. A silver-colored surface over reddish material may support a plated copper-alloy comparison; it does not verify either layer’s composition or thickness. Do not create wear to investigate.

For a silver-colored item with stamps, use the silver identifier. For a gold-colored nugget or flake, compare it with the gold identifier.

Metal-looking material may be a natural mineral, an industrial byproduct or a made object. Branching reddish material attached to rock can invite a native-copper comparison; metal beads within glassy material can invite a slag comparison. The page topic and a locality label do not establish either explanation. Include the attachment and surrounding material rather than cropping to the brightest patch.

Threads, regular holes, repeated dimensions or a mold-like seam may support manufacture. Irregular shape alone does not establish natural origin, since corrosion and breakage alter made objects. The National Park Service describes native copper in Michigan, but that regional history cannot establish a find’s source or age. A coin, buckle or other relic needs separate documentation for authentication.

For copper still in rock with other minerals, use the ore identifier.

One piece can fit two rows, such as plated iron that rusts through its coat.

For relics from fields, beaches and old homesites, the metal identifier describes the metal and corrosion and reads any visible letters, numbers or designs. Coins, buttons, buckles and bullets are named by type only when the design shows, and never dated or authenticated. Check the rules first: an NPS page notes that federal regulations prohibit possessing or using a metal detector in national parks. On private land, ask the owner.

If you already observed magnetic attraction, note which component responded and how it was checked. Attraction may come from a core, fitting or inclusion; non-attraction does not identify a precious metal. A photo cannot measure magnetism, density, softness or mass. Do not handle an unfamiliar object merely to complete the form, especially if its construction or purpose is uncertain.

Unknown coatings and corrosion may contain hazardous material. Avoid disturbing loose powder, sanding, heating, filing or applying acids for a photograph. Follow suitable local advice for an uncertain find rather than treating a visual label as a handling assessment. If an object resembles ammunition or a sealed industrial component, leave it undisturbed and contact the appropriate local service.

Use the first image as a map of the object. Show where each later close-up belongs, including a clasp, joint, blade, rim or exposed edge. Different components can have different materials, so keep the observation attached to its location. A mark on a handle may describe that component rather than the complete object.

Photograph a stamp straight on and from a second angle if reflections hide a character. Preserve the exact letters and numbers you can read, leaving gaps for uncertain characters. A familiar-looking number or maker-style symbol is a claim to investigate, not an assay or authentication. Include any existing acquisition record without inventing a date from corrosion.

For a follow-up, ask which visible area would separate the remaining candidates. A wider overview may help more than a stronger magnification when the issue is mixed construction. Keep the material provisional if paint or corrosion conceals it. That record gives a later conservator or analyst a clear question without encouraging damage to the object.