Awards & Engraving

February '19

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54 • A&E FEBRUARY 2019 STONE AND CERAMIC Both of these substrates fall into the same category based on their surface properties and behavior while being sandcarved. With both of these, you can find examples with surfaces that are either completely smooth or even, or some that are uneven to porous and rough. The smooth and even products are more user-friendly than the porous and rough ones. Talking about stone tiles, we usually deal with tiles made from granite or marble, which have a highly polished surface and have also often been treated with fillers as their matrix leaves holes in their surface after being cut. The fillers do fill these holes and cracks to make the surface even. Sometimes this affects how well your stencil sticks to the surface. These tiles also have a matrix consisting of at least two different colors, which makes it almost mandatory to think about color-filling the blasted areas to make the design or text readable. With these stone tiles, you want to choose the thicker version of your photoresist product because you have to blast longer to achieve depth. The depth is also necessary for the paint to be below the surface to protect it from being scrubbed while cleaning. You will blast these at about 40 pounds of pressure and hold your nozzle about 10 inches from the surface. Smooth ceramic tiles are a little bit trickier to deal with when it comes to resist thickness since it is hard to anticipate the thickness of the glaze that you have to blast through. My recommendation is always to get a few extra tiles to try blasting them with the standard photoresist thickness. If that fails, you know you will have to switch to the heavier material. Blasting pressure is between 30-40 pounds of pressure, depending on how deep you want to go and how detailed the design is; the more detail, the less pressure you want to A 10-by-12-by-1/4-inch thick glass piece in a lighted base blasted with a pre-cut vinyl stencil in surface etching and shading technique. This ceramic mug is deep blasted with 5 mil photoresist and partially color-filled to recreate logo colors. A ceramic tile deep blasted with photoresist. The clay color is white and gives a natural tone effect; there is no additional color-filling.

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