The stereotype is “they only buy long, straight, never-dyed”. Reality is narrower on chemistry and wider on colour and texture.
The Volos Store FAQ says one-colour dye is reviewed. Grey is a separate case. That is closer to “you can try” than to “they pay as for untreated”.
What usually does not pass
Bleach until the fibre is empty, keratin and other “smoothing chemistry”, henna that sits in the hair, extensions, mixed colours from many dyes. If in doubt — photos before the salon, not after.
Curls
A natural wave is not a defect. Straightening it “to pass as straight” hides the real length and condition. Photograph curls as they are: loose and in a ponytail, with a tape from the future cut.
How to take the measurement so length does not diverge from the cut — in the measuring guide. What not to do the day before — in mistakes that cut the price.
The company’s payout range and why dyed hair rarely claims the top of the corridor: how much you can get for hair.
To get a range for your own hair, send photos through the contacts on the homepage or leave a request there. Short answers to typical questions are in the FAQ.