. Practical concrete work for the school and home. egates should beappreciated by anyone attempting to make concrete in the object being made must possess a certain maximumof strength, it should not be placed in the coloring bath untilthe concrete has thoroughly hardened, as filling the poreswith the coloring matter in solution stops the chemical actionor changes taking place in the cement leading to hardeningof the concrete. 68 PRACTICAL CONCRETE WORK Coloring by absorption is effective on surfaces of con-crete after it comes out of the mold or after being treatedwith acid or tools.
. Practical concrete work for the school and home. egates should beappreciated by anyone attempting to make concrete in the object being made must possess a certain maximumof strength, it should not be placed in the coloring bath untilthe concrete has thoroughly hardened, as filling the poreswith the coloring matter in solution stops the chemical actionor changes taking place in the cement leading to hardeningof the concrete. 68 PRACTICAL CONCRETE WORK Coloring by absorption is effective on surfaces of con-crete after it comes out of the mold or after being treatedwith acid or tools. Surfaces that have been colored by absorb-ing mineral or metallic colors are less absorbent and theaction of the weather on the metallic colors is the same ason real metals, increasing the beauty of coloring by the usualoxidization noticed on bronze and copper. Surfaces of con-crete treated by such methods become so hard and densethat they will take a uniformly dull or high gloss pots, vases, flower boxes and similar wares finished. Another example of tooled surface finish. by this method are very attractive, the artistic possibilities ofsuch treatment being limited only by the colored sands andtaste employed by the worker. Aniline colors and the sul-phates of copper and iron are considered best adapted to themaking of solutions in which to color concrete by this capil-lary method.* In aiming at color effects secured in part by mixing colorswith the cement used to make a batch of concrete, it is veryessential—if permanent tints are to be secured—that only From Concrete, published in Detroit. PRACTICAL CONCRETE WORK 69 reliable pigments be used. The cement, sand and coloring-matter are mixed together dry, and it is advisable to experi-ment a little to find how much color is needed to give thedesired shade. When water is added to the mixture, themortar will appear considerably darker than the final surfacewill be when thoroughly hardened. By mixing 5 pounds ofc
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