Solid 99.9% Pure Bare Copper Wire Bonsai Jewellery DIY Craft 0.4mm to 2.0mm

A general rule is to select wire that is approximately one-third the diameter of the branch being trained. For fine twigs (under 5 mm thick), 0.5–1.0 mm wire is typically sufficient. For branches 5–15 mm thick, 1.5–2.5 mm is common. Trunk work on larger trees may require 3.0–5.0 mm. When in doubt, size up — wire that is too thin will not hold the set.

Yes. Copper work-hardens as it is wrapped, which increases its rigidity after application. This makes copper wire particularly effective for bonsai compared to aluminium at equivalent gauges. Thicker gauges (2 mm and above) provide substantial holding force for heavier branches. Leave the wire on for one full growing season, then remove carefully to avoid cutting into bark.

Bare copper can react with skin moisture and acids, leaving a temporary green or black mark on some people — this is copper oxide/carbonate and is harmless. For jewellery worn directly against skin, applying a thin coat of clear jewellery lacquer or Renaissance Wax to the finished piece will significantly reduce this effect. Alternatively, use this wire for structural components (frames, clasps) rather than direct-contact surfaces.

Yes, bare copper wire is electrically conductive and suitable for hobby electronics applications such as grounding leads, coil winding, antenna elements, and low-voltage DIY wiring. It is not rated or certified for mains electrical wiring — for any mains-voltage application, use appropriately rated and insulated cable that meets your local electrical code.

Bare copper oxidises naturally when exposed to air and moisture. To slow this process: store unused wire in a sealed zip-lock bag with a small silica gel sachet; apply a clear lacquer, paste wax, or Renaissance Wax to finished pieces; or deliberately accelerate patination with liver of sulphur for an antique finish and then seal it. For bonsai wire, oxidation is generally not a concern as the wire is removed after the branch sets.

For jewellery making: round-nose pliers, flat-nose pliers, flush wire cutters, and a mandrel for forming loops and rings. For bonsai: dedicated bonsai wire cutters (concave-jaw type) for clean removal without bark damage, and your hands for wrapping — gloves are optional but recommended for thicker gauges. For sculpture: standard needle-nose pliers and side cutters work well for gauges up to 2 mm; heavier gauges may require lineman's pliers.

The wire is supplied as a coiled length. Shorter lengths (1–3 m) will have a natural coil memory that can be straightened by pulling gently through your fingers or over a smooth edge. Longer lengths (5–10 m) are wound in a larger coil. If you need perfectly straight wire, draw it through a draw plate or pull it firmly between two fixed points before use.