hi heidi
not sure what the hell lucy is going on about :dunno:
re dying your hair, as far as i know, dyeing your hair does not cuase loss at the roots (i.e. true alopecia) but over dyeing it can cause breakage somewhere on the shaft. this is especially true if you are dyeing to light colours such as blonde.
you mention you have dark hair? this means most dyes on the market will have no more than 6% peroxide (and some will have lower) and thats if you go for a permanent dye. Semi-permanent dye is even more gentle, but will wash out in a couple of weeks or so.
If you are really worried, try using the gentlest of them all, herbal semi colour (a good brand is Herbatint) - but this does wash out in 4-5 shampoos.
the real criteria to go for is they type of alopecia you have got. do you have any dermatitis of the scalp or any inflamation. some alopecia aufferers suffer from scalp issues whilst other (like me) just lose hair but their scalp is healthy.
if your scalp is healthy......and always has been, then permanent dye should be ok. when you get regrwoth, remember to dye only the bits that are grey, do not re-dye the whole shaft (as its permanent colour, the colour should not wash out). with semi's / herbals the colour washes out so you'll need to do the whole shaft each time.
its up to you, if you're nervous go for the vegetable semi and then progress from there
xxx