Been using these type (Phone China marker) to mark on steel and some other surfaces. But these aren't ideal (not sure if they're just not well made any more or what), but difficult to sharpen and
simple stuff: china markers. – Reading My Tea Leaves – Slow, simple, sustainable living.
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Mechanical, Refillable Marking Pencil that writes on any non-porous surfaces, such as metal, acetate, plastic, glass, and even photos. Red grease pencils are best for marking on transparent and light colored surfaces. Wax lead is non hazardous and non-toxic making it safe to use in both industrial and households. Unlike peel-off china markers, these mechanical pencils can be used fully (no wastage) and can write on wet and damp surfaces.
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Balzer Designs: Art Tip: China Marker/Grease Pencil