[Greenbuilding] concrete colorants

[George Tremblay]

I've located an explanation of how carbon black appears to "fade":
http://www.blueconcrete.com/blackconcrete.html

>From that source, it sounds like carbon black should be part of my
coloring plan.

George

Norbert Senf <mheat at mha-net.org> writes:
>At 02:57 PM 2/9/2009 -0500, George Tremblay wrote:
>>Looking for a near-black color in a concrete countertop I'll be casting
>in
>>place.  The choices for through coloring (as opposed to surface
>>treatments) seem to come down to carbon black versus iron oxide.  My
>>understanding is that carbon black is more intense and less expensive,
>but
>>iron oxide fades less over time.  Anyone have strong opinions one way or
>>the other that could help me choose?
>
>Hi George: I've used carbon black in the past, and am not familiar with
>black iron oxide, although I've used the other iron oxide colors.
>
>I'd be interested in references, since off the top, I can't imagine how
>anything could get blacker than soot (carbon black), nor by what mechanism
>it could possibly fade.
>
>Thanks ...... Norbert
>
>-------------------------------------------
>Norbert Senf---------- mheat(at)heatkit.com
>Masonry Stove Builders
>25 Brouse Rd.
>RR 5, Shawville------- www.heatkit.com
>Québec J0X 2Y0-------- fax:-----819.647.6082
>---------------------- voice:---819.647.5092
>
>
>
>
>
>
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