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There are bascially 3 options.
Dye the entire truck of concrete. The extra costs are the price of the dye and the cleaning of the truck after the load is delivered.
The second option is to trowel in an additive to the first 1/4 inch of the concrete before it hardens which leaves that top layer the color you want. Higher cost of labor and the installer has to have experience or it can come out poorly. You also pay for the additive.
Thirdly, you can use concrete paint or dye which is applied after the concrete cures for 30 days. If you take this route you must etch the concrete with muriatic acid before you paint.
Scofield.com is a company which sells products for the top coat which is troweled in. They are very good and have had good field reps in the past. They may also sell the dye for the trucks as well.
Coronado sells a dye which is painted on the surface with a roller, almost a stain and it works very well but is very caustic and word is it won't be around much longer due to EPA regs. They also sell an acrylic based concrete paint which also appears to hold up well which you can use indoors with no ill effects. The color by coronado is Terra Cotta Red.
Which is the best? I think that the dyed truck load is the best. No matter how much you damage the concrete, there is always more red stuff below. I have seen the troweled application have the top layer spall when it is an outside application. Interior applications of the trowel jobs seem fine.
Paint is good especially on the interior. The best look is probably the first two options as the concrete looks more rich and interesting when installed and takes on a great patina after a while.
Painting also requires touchups and you have to make sure the etching job is done correctly.