Redyeing faded purple hair, Help!

You do not need to re-bleach. Once your base is light enough you shouldn't have to ever bleach again except re-growth.
You can put your chosen purple straight over what you have now. I would go for Special Effects, Pravana or Adore over Manic Panic as they last better.
You will need to dilute the stronger dyes with conditioner, this will help prevent bleeding/transfer.
To prevent fading you first need to leave the dye in for a very long time, I aim for at least two hours, preferably four. many people leave it overnight. Then rinse with cold water and a vinegar rinse to help seal the colour in.
When using direct dyes you need to change your hair care routine as hot water, shampooing and styling all fade colour.
So wash less often with cooler water and a sulphate free shampoo or just conditioner. Cut down on styling products and heat styling.
lastly you can add some of the dye to your regular conditioner and use it after every wash to keep the colour topped up.

Wow Thank you Wicked Pixie for such a fast and thorough reply! You mentioned that I should add conditioner to the stronger dyes, how much and would Special Effects, Pravana, and Adore be considered a stronger dye I assume?

Your other tips are great and now I just want to run to the store and get everything. Thank you so much.

How much to dilute will depend on the dye. Special effects Deep Purple for example is very dark and will bleed like crazy if used neat, so requires quite a lot of conditioner adding. Adore is less prone to bleeding, so just a squirt or two of conditioner would suffice.

I use to be purple and found it faded quickly, that's the problem with semi- permanent colours, try to find a permanent one like live xxl mystic violet it blends well, and this is my best buy I used to keep my colour, Scott Cornwall's colour stop, using an anti fading product will protect your colour especially in the sun also, this has UV protection

I use to be purple and found it faded quickly, that's the problem with semi- permanent colours, try to find a permanent one like live xxl mystic violet it blends well, and this is my best buy I used to keep my colour, Scott Cornwall's colour stop, using an anti fading product will protect your colour especially in the sun also, this has UV protection

I could not disagree more I'm afraid. XXL dyes are heavily loaded with silicone and coat the hair really badly. Also, using the methods in this thread - http://www.hairdyeforum.com/index.php?topic=11009.0 - are much much better than using any so called anti fading shampoo, most of which are expensive and don't really work well.

Another reason is, when you redye the roots, you'll find the colour has faded. That means you have to redye over ALL the hair to top it up. That's really bad for the hair and just not worth it.

Of course semi permanent dyes fade, but there's LOADS of ways of making them last longer and they're infinitely better for your hair.

Plus you can't get that really vivid unnatural shade of purple with a permanent, they are all brown based and fade auburn.

Sorry silicone? I always thought this makes the hair look healthy and causes no damage, I always used these dyes and my hair never seemed damaged, and never afraid to go out in rain without purple colour running down my face on my clothes ect, I have looked into this because I'm confused found this http://blackhairmedia.com/hair-care/silicones-in-hair-products-good-or-bad/

I also love the semi colours their fab but don't last, but if u have healthy hair anyway, should you be worried about silicone? When bleach is much harsher an used before these colours, most permanents don't even require pre bleaching unlike semi's so what is really worse its all confusing to me now after reading your post and the article

There is a high level of peroxide in the permanent dyes you are using, this is extremely damaging over time as you are effectively bleaching the hair everytime you re-colour.
with direct dyes you only bleach the hair once then add the colour as many times as you like without any further damage.
If you use the better direct dyes and alter your hair care regime to avoid fading and bleeding they will stay true for many weeks.
Silicones coat the hair and mask damage, they don't repair the hair. They can build up with repeated use and prevent oils and water from being able to enter the hair causing it to become more damaged in the long term. So no, they are not damaging in themselves, but should be used with care. Many of us avoid harsh shampoos in order to preserve our colour, so we also avoid silicones as they need the strong chemicals in shampoo to wash them out.
The type of silicones in XXL hair dyes lock the colour is so it is really difficult to remove if you ever want to change colour.

Sorry silicone? I always thought this makes the hair look healthy and causes no damage, I always used these dyes and my hair never seemed damaged, and never afraid to go out in rain without purple colour running down my face on my clothes ect, I have looked into this because I'm confused found this http://blackhairmedia.com/hair-care/silicones-in-hair-products-good-or-bad/

Reading that explains exactly how silicone can effect the hair negatively, whilst also explaining how the actual silicone itself is none damaging. As WickedPixie said repeated use will eventually in the long run cause more harm then good. I use to use XXL dyes all the time from the age of about 14 onwards & I too always use to think my hair was fine as it always looked & felt it. Until I started trying to fade it out so I could bleach & use colourful semi dyes, my hair was very dry & visibly not as healthy as I had thought. I then went to salon without using a colour remover before hand & where the dye had seriously stained my hair from the silicone being melted onto the hair shaft where I'd always used heat, the colour just would not budge which resulted in them over processing my hair but that's another story! I'd honestly stay well away from XXL dyes, people have had good results with their bleach but the dyes are seriously no good for you hair. A semi really is the best way to go & as others have said, there are ways of keeping the colour in to last longer. I've found a vinegar rinse really helps well, whilst also adding dye to your conditioner to top up each time you wash your hair, there are ways. I'd never go back to anything else other then a semi, even if I wanted to go back to a natural colour.

That explains it then, thanks for the reply and explanation.

I'm not against any use of silicone.

But xxl dyes just don't work as well for super bright colours, partly because bright colours are the ones that go first. The silicones hold on to most of the dye super tightly, but not the bright part of the colour. It holds on to the brown. As wicked pixie says, the peroxide in xxl dyes is strong. The silicone in the dye then masks that damage but prevents any protein or moisture then added getting in,

As the article says, not all silicones are equal.

Okay so I did what everyone said and dyed over my hair using Pravana Vivids Violet. My roots were growing back so I bleached just the roots but left everything else the faded shade of purple. The results were AWESOME. It was such a pretty purple and the color didn't rub off on everything. Except today I finally washed my hair with shampoo and now my hair is almost a brownish color with a lightish tint of purple. I believe this is from putting purple dye over faded purple hair? The parts of my hair that are still vibrant are the parts I re-bleached (the roots) Any tips on getting my hair to return to purple? Will I have to try a bleach bath or should I just try to fade it out and re-dye over it again?

Quick Summary: I redyed my faded purple hair and after shampooing, the color is now brownish. Help!

What kind of shampoo do you use?

Sounds something like build up of silicone on the hair that wasn't bleached this time. Did you use a clarifying shampoo on the rest of your hair after bleaching? The bleach will have stripped any silicone or other product from your roots, but not from the rest. I would try using a clarifying shampoo now and re-dye.