YMMV, but if it does cover the greys it will be bright orange unless you do enough henna applications to make it darker. If your goal is grey coverage and if I were you, I can't say I would cut the henna with cassia unless you're looking for the brighter, more orangy shades. I would collect greys and strand test, and if the strand test works (that is, henna sticks), if the color is not what you want on the initial application, I would I would repeat applications until it hits the shade you want, then do that many applications on your greys.
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