Hi Danielle,
Your question is interesting and a challenge at the same time. I will explain below as to why you should not use semi-permanent colours.
Semi-permanent colours do fade usually much more on the ends than on the roots, the reason is that the hair on the ends has lived longer and is more exposed to the sun and other elements. Whereas the hair from the middle length to the roots will have more protection from natural oils flowing from the scalp and is protected from the sun and various elements. It is due to this that you have colour build-up there.
I always recommend to clients with long hair to use the best available shampoos and conditioners, as well as using regular deep penetrating hair treatments. The reason for this; hair in good condition will hold colour molecules longer, the cuticles are closed and the hair looks shiny and healthy, it is also much easier to style.
Using heat (Irons) of any kind will eventually dry and damage the ends of your hair. For all these reasons, it is essential to use the very best hair products. The Celebrities you see in magazines, TV and red carpet events use the best products to achieve the colours and shine on their hair. There is no short cut! Long hair does need more love and attention to look good, it is a fact that long hair costs more money!
May I suggest that you visit a colour expert at a reputable salon. Personally, I would never suggest using semi-permanent colours on long brown hair. There is a massive difference between permanent and semi-permanent colours. A semi is usually applied all over at the same time, where as a permanent colour is applied carefully by selecting the colour needed on different parts of the head - by selecting certain hair sections and using different shades of brown, depending on the colour the hair is and the colour required.
If you would like to have a lighter shade of brown, it may be necessary to first lightly strip the dark colours to get a more even shade before using a permanent tint. A good colourist will most probably use different shades of brown on different parts of your hair to achieve the all over colour you want. You will need a true colour artist to do this type of work! There is no easy way out. Your hair needs a lot of love and care, and by using the best home hair care products your colour will stay looking vibrant and shiny.
I do hope you follow my suggestions; you will soon look like a star! My main point is to find an artistic colourist, someone who loves a challenge and loves colouring. The best way to find a good colourist is by recommendation, or stop someone on the street, supermarket or bus when you see a women with the hair length and colour you want. Ask them where they have their hair done, it's a great way to find your future colourist/stylist.
I wish you a good summer and a beautiful new you.
