Superior developers made from naturally derived ingredients to provide ideal viscosity and create optimal application for best results. The cream developer is compatible with the Juvexin Color Line and offers up to 4 levels of lift.

FAQ 

Q: What does “40 Volume” mean and what does this developer do?
A: “40 Volume” refers to a stronger hydrogen-peroxide level (approximately 12% peroxide) that allows hair color or lightener to lift the hair pigment more aggressively — enabling up to about 4 levels of lift (or more under optimal conditions) compared to lower-volume developers. 

Q: When should I (or a stylist) use 40 Volume developer instead of lower-volume options?
A: Use 40 Volume when the goal is significant lightening or high-lift — e.g. for blondes, balayage/highlights, or dramatic color/lightening services — especially when starting from a darker base or when a strong lift is required. It’s generally not recommended for simple color deposit or small shade changes.

Q: What precautions and considerations should be taken when using a 40 Volume developer?

• Because of its strength, it can be more damaging or drying than lower-volume developers, so it's best used with proper after-care (conditioning treatments, protein reconstructions, etc.).

• Use with care on previously lightened or damaged hair — always perform strand tests.

• Ideal for salon-use rather than casual home-use, given the strength of the lift and need for professional technique.

Q: How is it typically mixed and used with GK Hair color or lightener products?
A: When mixing with GK Hair lighteners or high-lift cream colors, follow the brand’s instructions for ratio and processing time. GK Hair notes that their cream developers (including 40 Vol) provide “optimal application” and “ideal viscosity” for predictable results. 

Q: What results can clients expect using 40 Volume developer properly?
A: If used correctly — significant lift toward lighter levels; lighter base for blondes or highlights; enabling strong lightening for balayage or dramatic color transformations; more responsive lightening even on darker hair bases.

Q: Why should salons or stylists carry GK Hair 40 Volume Developer?
A: Because it enables offering high-lift, professional-grade lightening services — a high-demand segment (blondes, balayage, highlights). Its cream consistency and compatibility with GK Hair’s color/bleach system give stylists control and flexibility, while its formulation aims to balance lift power with hair care.