The acid used to etch the surface has darkened the parts richest in copper, while those richest in tin remained white.
In fact the uniformity of brass and bell-metal is only superficial; if we adopt the methods described in the article Metallography, and if, after polishing a plane face on a bit of gun-metal, we etch away the surface layer and examine the new surface with a lens or a microscope, we find a complex pattern of at least two materials.
There are a few materials you'll need to etch on glass both successfully and safely.
If you have anti-reflective coating on your lens, remove scratches with Armour Etch.
Etch designs in the pot and set aside to dry.
A quartz counter doesn't require any of this; it doesn't stain, scratch or etch.
With etchings, this company uses a sandblaster to actual etch your chosen label into the bottle and then paint it in the colors of your choosing.
While attending to the girl, the doctor reported watching the words "Esther Cox you are mine to kill" etch itself into the wall plaster by unseen hands.
But if we polish the solid alloys, etch them if necessary, and examine them microscopically, we shall find that alloys on the lead side of the diagram consist of comparatively large crystals of lead embedded in a minute complex, which is due to the simultaneous crystallization of the two metals during the solidification at the eutectic temperature.
Atomic Force Micrograph image of MgO (100) face etched in deionised water showing pyramidal etch pits.
Robin sprayed the bare metal with 2K etch primer.
I run Debian woody, sarge, etch and sid on various machines at home, as well as WinXP and OSX.
Acidic foods should not be left sitting in the sink as it could etch the sink.
However, it can stain and etch if not cared for properly.
This is because marble will stain, scratch and etch if used in a kitchen.
Granite, like all natural stones, can stain, etch and chip.
While it will certainly remove the tarnish, many toothpaste products contain micro-abrasives that can etch the surface of the metal.
Solutions include Armour Etch, Pledge, Brasso, and more.
Egress Etch offers single-use glass etching stencils for a reasonable price.
If you want to paint bumpers, buy the chemical that lets you etch into the material, and holds paint better.
We use the TMW generic photo etch set for railings and ratlines and the ' Russ Wild / Scott Reigel ' window decal set.
etch pit, large enough to be visible under low magnification in the optical microscope.
etch prime the bare metal surface.
However, most are hand engraved as single picks or in small batches using a laser engraver to etch the surface of the metal with the desired design.
Acid - Corrosive acids such as hydroflouric acid are carefully spotted on the surface just long enough to etch the design and are then washed off.
The word usage examples above have been gathered from various sources to reflect current and historial usage. They do not represent the opinions of YourDictionary.com.