How often can I use a semi-permanent hair dye?

Can u use semi/demi hair dye to slowly dye your hair?

• ok i read on a site that if you use semi/demi permanent hair dye to sye a streak of your hair, your supposd to mix the rest of the dye with a shampoo/conditioner adn use it once a week to refresh the colour, could i just mix the dye with a shampoo and use it once a week(or every other day) to slowly dye my hair,

• Answer:

  Eh..Slowly color your hair? I don't think that's possible, even with shampoo. Once you put the color on, It'll color the whole thing to the color you want. I have never heard of putting color in Shampoo, Only bleach. I wouldn't try it, Because it may not even work.