I would like some valuable advice on why when I dye my hair the roots always come out way lighter than the ends. I've tried misting the ends so that they don't absorbe the color as much but this does not work. Can anyone please advise me on how to get "Even" haircolor at home? Your help will be greatly appreciated.

Caveat: I am not a hair color professional. I have copied some discussion of the professionals... for you, to help explain...

Good professional salons..

Put permanent color on the roots and semi/demi on the ends (especially when the hair is previously colored). Since the ends had permanent color on them and they needed refreshing a semi permanent was a good choice because it's low in ammonia and helps maintain the integrity of the hair.

Never pull permanent color through the ends of previously colored hair. One of the main reasons for this is the effect oxidation has on artificial color molecules. Oxidation (which happens either in the client's hair or in the bowl) causes the dye molecules to swell, which is why the color stays in the hair. Ammonia (or another swelling agent, if you use ammonia-free color, such as Biosilk) swells the hair shaft, opening the cuticle layer of the hair. Hydrogen peroxide then penetrates into the hair shaft, diffusing natural (and to a lesser degree, artificial) pigment, and then the color molecules enter the hair shaft and expand. The dye molecules expand through oxidation in the bowl as well, this is why the tint slowly changes color in the bowl. After the color has sat in the bowl for 30 minutes of so, and gotten all dark, those dye molecule are finished expanding, leaving them unable to penetrate the hair shaft. All you accomplish at this point is a temporary cuticle stain. The hydrogen peroxide and ammonia, however, are still active, the ammonia swelling the hair shaft, and the peroxide diffusing any pigment it can. This is what leads to continued fading. Additionally, you have very little control over the staining of the cuticle, sometimes resulting in undesirable undertones appearing, sometimes resulting in dark build-up.

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In a nutshell, as I read it, You are not supposed to continuously color your hair. The melanin on the previously colored hair is not absorbing the color.

You are only supposed to touch up the roots.
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So what do I recommend you do?? Call the 800 number for your brand of hair color. Let them make suggestions.

I am a stylist... firstly the boxed colors are extremely harsh for your hair... " one size fits all" does dot work well for everyone. Secondly, as stated by Foxes above, you should not continuously color over the same hair because each time you color you are removing some of the cuticle and it no longer has the strength it prevoiusly did. This is why your hair feels bad on the ends, it is due to overprocessing. If you have no other option than to use boxed color , always use the same color so you don't have to pull it through the ends, apply the color only to your new growth, and you will not have this problem