What to look for in a good quality spider adult?

I saw a spider with alot of white speckled pattern down his spine from head to tail. I have never seen a spider with it before. Is it normal?

Go by personal preference. I personally love high white speckling and when the pattern breaks into the white lower portion of the speckling. But that's just me.

It depends...

Is it a pet or a breeder?

If it's a pet go for the colour you like.

If it's a breeder, have the seller pre scent and feed it for you in front of you. If it spins upside down and crawls on the ceiling of the enclosure, find a new one.

usually see the white crawling up the sides, not so much on the back, without actually seeing it, i'd say go for it.

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Originally Posted by wasuslitherin

I saw a spider with alot of white speckled pattern down his spine from head to tail. I have never seen a spider with it before. Is it normal?

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No not normal sounds like some kind of injury down the spine..

Does it look like this?http://tapa.tk/mu/47a996a2-568e-4de2.jpg
This is a rescue I got a few years back who escaped from her original owners enclosure and when he found her he ripped her out of her hiding place scraping the scales off of her back. When I got her she had a scab going up her spine.