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The amount of powder bleach and developer you need to lighten hair to a blonde shade depends on several factors:

  1. Hair Length and Thickness

Short Hair (pixie or above the chin): ~1 scoop (30g) of bleach powder + 60ml (2 oz) of developer.

Medium-Length Hair (shoulder length): ~2 scoops (60g) of bleach powder + 120ml (4 oz) of developer.

Long/Thick Hair (past shoulders): 3+ scoops (90g or more) of bleach powder + 180ml+ (6 oz or more) of developer.

The typical mixing ratio is 1:2 — one part bleach powder to two parts developer — but always check the instructions on your product.

  1. Developer Strength

20 Volume: Lifts 1–2 levels — good for subtle lightening or already light hair.

30 Volume: Lifts 2–3 levels — ideal for medium brown hair.

40 Volume: Lifts 3–4 levels — only for dark hair and should be used with caution.

Warning: Using 40 vol developer increases the risk of damage. Do strand tests first and don’t leave it on longer than recommended (usually 30–45 mins max).

  1. Your Starting Color

Dark Brown/Black Hair: You may need multiple bleaching sessions to reach a blonde tone. Space sessions a few weeks apart to avoid damage.

Light Brown/Blonde Hair: One session with 30 vol developer and bleach is often enough to reach pale yellow (the base for blonde tones).

  1. Toning Afterwards

Bleaching lifts pigment but can leave yellow or orange tones. Use a toner or purple shampoo to neutralize brassy tones and achieve the desired blonde shade.

Pro Tip: Always do a strand test before a full application. Hair can react differently based on its history (previous dyes, damage, etc.).

If you're unsure, consult a professional — bleaching mistakes can be hard (and expensive) to fix.

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