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What Exactly Is Developer Volume 30? Developer Volume 30 (also known as 30 Vol) is a type of developer that is usually used in conjunction with bleach to lighten your hair. This developer will assist you in lightening your hair by two or three shades. This also aids in the embedding of more pigment into your hair shaft. If you do not have severely damaged hair and want a long-lasting bright color on your hair, a 30 volume wholesale virgin hair factorywill be an excellent choice for you. If your hair is resistant to color, this devel... more