Wasn't it Bill Hails who wrote:
>Hi.
>I'm getting back into things after an enforced hiatus,
>so here's a question.
>
>I'm trying to use a perturbed isosurface to subtract some
>damage (chips etc.) from some csg stonework.
>
>The actual code is quite complex, but essentially I have:
>
>difference {
>    object { Stonework }
>    isosurface {
>        // isosurface cylinder + pigment function
>    }
>    texture { T }
>}
>
>The pigment function is the same as the pigment used by T.
>
>The max_gradient is set so that there are no warnings,
>however the common surface looks a *lot* darker than
>the rest of the stonework (but not just black).
>
>There is too much interdependant code to post that, but
>I'll put a little pic on p.b.i to illustrate.
>
>Hope someone can help.

What value are you using for max_trace?

-- 
Mike Williams
Gentleman of Leisure

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