Choosing developer volume depends on your starting shade, hair condition, and how much lift you’re aiming for. Here’s a quick guide:

• 10 volume: Very subtle lift (or just activation for toners/glosses). Good for minimal change.
• 20 volume: Moderate lift (about 1–2 levels) and commonly used for highlights or root applications when hair is in good condition.
• 30 volume: More noticeable lift (often 2–3 levels) and typically used off-scalp or in foils.
• 40 volume: Maximum lift potential; higher risk of dryness or irritation and usually kept off the scalp.

Always follow the product’s instructions, strand test first, and monitor frequently. You’ll find a range of developer strengths on Walmart.com, with options for pickup or delivery.

Both can work, but they serve different needs:

• 20 volume can suit fine or previously lightened hair and moderate lift goals. It’s a common choice for controlled, on-scalp applications when the product allows.
• 30 volume is often chosen for thicker or darker hair when you need extra lift, typically off the scalp or in foils for added control.

Consider hair history, porosity, and sensitivity. A strand test can show how your hair responds before committing. If in doubt, starting with a lower volume and reassessing may be more forgiving. Always use the mixing ratio and timing recommended by the bleach and developer you’re using.

Think of 30 volume as a stronger yet measured option and 40 volume as the most aggressive. Many users reserve 40 volume for off-scalp techniques where maximum lift and speed are needed, noting it can increase dryness and sensitivity risks.

• Choose 30 volume if you want more control and are willing to process a bit longer.
• Consider 40 volume only if your product and technique call for it, typically off the scalp, and you’re comfortable monitoring closely.

Multiple, well-spaced sessions with lower volume can be a gentler approach than one high-volume session. Always follow the manufacturer’s timing and safety guidance and perform a strand test first.

For soft, low-commitment changes, 10 volume is often used to activate bleach for very minimal lift or for toning/glossing with compatible products. If you want a small but noticeable bump—like brightening highlights or a careful root application—20 volume can be a practical step up.

• Use 10 volume when you’re aiming for the gentlest shift or refining tone.
• Use 20 volume for 1–2 levels of lift when hair is healthy.

Previously colored hair may lift warm, so selecting a blue- or violet-tinted lightener can help counter brassiness. Always follow package directions, strand test, and reassess before moving to higher volumes.

Always follow the ratio on your specific products, since formulas vary. Many lighteners call for a 1:1 to 1:2 powder-to-developer ratio. Aim for a creamy, spreadable consistency that won’t drip.

1. Measure with non-metal tools for accuracy.
2. Mix small batches so the blend stays active and fresh.
3. Adjust within the manufacturer’s recommended range—don’t over-thin.
4. Apply promptly and monitor the process; re-mixing fresh is often better than overextending the first batch.

Results can vary by hair condition and technique, so a strand test helps dial in ratio and timing. Walmart carries both cream and liquid developers to pair with your chosen bleach.