tuinurn betonurn boxurn Box 88 "Mahogany screens"
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Deze designurn betonnen box heeft een forse hoekige robuuste vorm met in de diepgelegen vlakken een mahoniebruine kleuring d.m.v. acid staining. Deze kleuring zal ( met name als de box buiten wordt geplaats) onder invloed van de omstandigheden steeds blijven veranderen.
Acid staining is not a dyeing or pigment-base coloring systems, but a chemical reaction. A mixture of water, mineral salts and a slight amount of muriatic acid is applied to the concrete surface. This chemical reaction with the existing minerals (primarily lime) in the concrete over a period of one to four hours creates new earth tone colors on the concrete surface. The concrete surface is later scrubbed to remove excess stain and neutralized by a basic solution of ammonia and water or baking soda (less likely to cause whiting later) to help raise the ph level back to normal level. Due to inconsistencies in the surface level of concrete floor, acid staining creates a variegated or mottled appearance that is unique to each slab. The color penetration ranges from 1/16 to 1/32 of an inch. Older exterior concrete surfaces may not color as well as interior surfaces because the environment has leached or percolated out the mineral content. As well, any exposed aggregate (rocks) in worn concrete will not accept staining.
Chemicals commonly used in acid staining include hydrochloric acid, iron chloride, and sodium bicarbonate.