Deep Etching Polished Aluminium? Shine on with Dynalith ER 400 December 1999 Fred Axon and TOny Averill, Shipley Ronal Europe Abstract: Environmentally friendly photo-etch resist strips without solvents. Fashions change – especially in the automotive industry. And over the last couple of decades, there has been a marked trend towards ever-diminishing amounts of bright trim on cars. But now it looks like the trend has been reversed — bright trim is back! However, the old chrome players needn’t get too excited; this time around it’s deep etched aluminum that is increasingly finding favor as the fashionable decorative material.