then, if you're not straying to far from your natch color, you could simply avoid those areas where the gray is coming in, and towards the end of the processing, mush it all together (totally non-technical speak for 'blend') for the last five-ten minutes.
or..as you get grayer, apply conditioner to those areas (on dry hair) to act as a buffer to the coloring product. the conditioner will sort of shield the product from penetrating. that way you don't have to worry about getting too much color where you don't want it.
which brings me to another tip..idk how you apply your semi, but if you find certain areas/ends/shaft getting darker than you like (as in accumulating too much semi-perm color over time), you can do the conditioner-trick in those areas, as well.
a lot of the time, we tend to grab color near the temples, and browns tend to go much darker in that area..for some reason. i did this on my clients, to avoid grabbing.
at 3:32 PM on Jun. 14, 2011