Compounds with metal cations (positively charged ... in the presence of chloride ions from hydrochloric acid effectively resets the etching solution, restoring the cupric chloride and making ...

Police have seized acid-etching equipment in homes of known taggers ... “The tragedy of this kind of vandalism is it encourages a return to the [metal] roll-down doors.” ...

The primary components are a vertical salt water bath, DC power supply, metal to etch, scrap steel approximately the same size, and a water agitator, which in this case is an air pump and diffuser ...

Phosphoric acid works on smooth or rough concrete, but you don’t need its big benefit, which is its suitability for both concrete and rusted metal. With any etching product, it’s very ...

Scientists there have developed an electro-chemical etching process that not only allows different metals to be strongly bonded to one another, but that also lets metal be bonded to almost any ...

For now, though, investigators such as Klees must rely on standard methods, such as acid etching, which eats away at the grains in damaged regions of metal faster than in undamaged ones ...