Beauty Creme Developer Showdown: 20 vs 30 vs 40 Volume Compared
The genuine Schwarzkopf Igora developer versus a professional 20 volume alternative. We compared Schwarzkopf Igora Royal Developer against ForPro Expert 20 Volume Creme Developer on consistency, performance, size, and value.
| Factor | Schwarzkopf Igora Royal Developer | ForPro Expert 20 Volume Creme Developer, |
|---|---|---|
| Brand | Schwarzkopf professional | ForPro professional |
| Volume options | Multiple volumes available | 10 to 40 volume range |
| Consistency | Reference standard consistency | Reliable pro consistency |
| Best paired with | Igora Royal color | Any permanent color |
| Bottle size | Standard pro size | Generous 32 fl oz |
| Lift performance | Predictable, even lift | Standard two levels at 20 vol |
| Value | Premium pro pricing | Excellent value per ounce |
| Price | Check price | Check price |
Our Verdict
Pick the Schwarzkopf Igora developer if you use Igora color or want the industry reference standard for predictable results. Pick the ForPro 20 volume if you want generous size and excellent value for standard gray coverage and coloring. Both are professional grade; match the developer to your color line when possible.
More Top Picks in This Category
Not sold on either of these two? Here are more bestselling options worth considering.
Best for: Stronger lift for lightening services
Salon Care 30 Volume Creme Developer, 32 Oz
- 30 volume for 2 to 3 levels lift
- 32 oz salon size bottle
- Creamy easy mix consistency
- For high lift color and bleach
Pros
- Great price for the size
- Good for lightening
- Smooth mixing
Cons
- More damage potential
- Not for scalp retouch beginners
- Single volume
Best for: Maximum lift, experienced users only
Salon Care 40 Volume Creme Developer
- 40 volume for 3 to 4 levels lift
- For high lift blonding services
- Professional salon formula
- Use with lightener for max lift
Pros
- Maximum lifting power
- Very affordable
- Pro grade
Cons
- Highest damage risk
- Not for beginners
- Handle with care
Volume Selection: 20 vs 30 vs 40 Explained Safely
Developer volume is the most misunderstood number in home coloring, so here is the safe explanation. 20 volume lifts one to two levels, the standard for gray coverage, darkening, and tone-on-tone color. 30 volume lifts two to three levels, for going noticeably lighter or covering resistant gray. 40 volume lifts three to four levels, reserved for high-lift blonding with professional lightener, and the most damaging option. The safety rule beginners miss, higher volume is not "better color," it is more lift with more damage, and choosing 40 when 20 would do is the most common home-coloring injury. Never use 40 volume on the scalp for all-over lightening at home, the burn and breakage risk is serious, and overlapping 40 volume on previously lightened hair causes the breakage horror stories. The products here cover the range, the ForPro 20 volume for standard work, the Salon Care 30 and 40 for progressively more lift. When in doubt, go lower and process the full time, patience lifts more safely than volume. Our Schwarzkopf developer guide explains all volumes safely.
Metallic Salts and Developer: The Dangerous Combination
The single most important safety knowledge around developers involves metallic salts. Some box dyes, especially gradual-darkening formulas, contain metallic salts like lead acetate or bismuth citrate, and when developer or bleach meets metallic salts, the reaction can cause extreme heat, smoking, and hair that breaks or disintegrates. How to check before you mix, read the previous dye's ingredient list for metallic compounds, and be suspicious of any "progressive" or "gradual" color. What to do if you have used metallic dye, do not apply developer or lightener over it, the safe path is growing it out or professional color removal, and always tell your stylist the full history. This is also why the strand test is non-negotiable, a small hidden section tested first reveals a bad reaction before it is on your whole head. Most fashion developers like these are designed for professional color lines, not metallic box dyes, but the check takes thirty seconds. When the stakes are chemical heat on your scalp, thirty seconds is cheap.
Patch Testing and Safe Handling
Developer plus color involves real chemistry, and the safety protocols are specific. The 48-hour patch test, mix a tiny amount of the color as directed, apply behind the ear, and wait two full days, checking for itching, redness, or swelling, which signal allergy, usually to PPD in the color rather than the developer itself. Safe handling of the developer, wear gloves without exception, avoid contact with eyes, do not use on broken or irritated scalp skin, and work in a ventilated area, since the fumes irritate. Timing discipline, process for the recommended time only, leaving developer on longer does not lift more after the peak, it just damages more. The mixing ratio matters, follow the color line's specified ratio exactly, eyeballing the developer-to-color proportion gives unpredictable lift and tone. Store developers sealed and away from heat, degraded developer loses lifting power and gives uneven results. Professional products demand professional respect, the results are better and the risks lower when the protocols are followed.
Hard Water Before Lightening: The Mineral Problem
Hard water minerals interfere with lightening in ways that surprise home colorists. Calcium, magnesium, and especially iron deposits on the hair react with developer and lightener unpredictably, causing uneven lift, off tones, and in the case of iron, a warm or orange cast that fights the desired result. The pre-lightening protocol, use a chelating shampoo one to three days before coloring, not the same day, which would leave the cuticle too open, to dissolve the mineral layer. Signs minerals are affecting your results, lift that stalls below the expected level, banding where previously colored sections lift differently, or persistent warmth that toner cannot fix. Well water users should be especially cautious, iron content varies wildly and affects lightener most. This is also why salon colorists ask about water, it is a genuine variable in the formula. For developer comparisons, see our best Schwarzkopf developer alternatives.