I use a sulfate shampoo whenever I color my hair which I have to admit is about once ever 2 weeks (I can't stand the grey). So before I color I use cones because I know I'll be washing them out with the sulfate poo.

I think once in a while is fine. My hair seems to be OK with this regimen. Probably the hair dye is worse than the cones! But I think the Mhen's snickers metaphor is correct - once in a while is fine - a steady diet of cones and sulfates probably isn't great for most curlies.

Let us know what works for you.
2/c-3a Coarse hair med. density.
Protein sensitive but can use occasionally
Highly porous. Color over grey.
I love all the Curl Junkie products and use CJ CCCL as my main styler. Still hoping for 2nd day hair....
Every day is a gift