... time in the circumstance of engraving black or white mark on the various of metals by many ... bright, gold, red, green, blue, yellow, black and white color, etc. it fit for colored for metal arts ... bright, gold, red, green, blue, yellow, black and white color, etc. It fits for all industries of metal ... aluminum hot-spreading slices, the audio box and column and so on. And on the basis of it, it can ...