Metal Acid Etching Pens

Metal Acid Etching Pens are specialised marking tools designed to create permanent, smudge‑proof black etches on a wide range of metals using a controlled acid‑based solution. They work like a felt‑tip pen, allowing precise freehand marking without the need for electrical equipment. These pens are widely used in machine shops, toolrooms, engineering environments, and manufacturing for identifying components, tools, batches, and workpieces.
They are available as disposable pens or refillable units, with different acid strengths to suit various metals:

Strong (Green solution) for heavy metals including stainless steel
Mild (Blue solution) for construction steels and non‑ferrous metals