Sewha P&c Sewha Sehwa

The Sehwa P&C High Bleach Powder (500g) is a professional-grade lightening powder used to lift color from dark hair before dyeing, create balayage or highlight effects, or achieve lighter blonde results on darker Asian hair. At 500g it is a bulk professional supply size - this is not a single-use consumer sachet but a professional jar that provides dozens of applications when mixed with developer (sold separately). Korean hair, which tends to have higher natural pigment density, typically requires a strong bleach powder for effective lift, and professional-grade formulations are designed for this.

Bleach powder should always be used with an appropriate volume developer (typically 20-40 vol depending on desired lift), and application requires careful timing - over-processing leads to breakage. First-time home users should patch-test, strand-test, and follow manufacturer instructions precisely. For major color lifts, professional salon application is recommended.

The Sehwa High Speed Pro Satchcolor Hair Dye (Natural Black, No. 7) is a professional permanent hair dye designed for speed. The "High Speed" positioning indicates a shorter processing time compared to standard permanent dyes - a typical advantage for professional salon use, where chair time per client matters. Natural Black is one of the most commonly used shades in Korean and Asian hair coloring, for covering gray hair completely or for returning over-lightened hair to a dark base. The No. 7 is the product's shade reference within the Sewha color range.

Permanent hair dye at this level requires a developer (typically 1:1 ratio), application to dry or slightly damp hair, and 20-30 minutes of processing time depending on the target result. Always perform an allergy test 48 hours before full application - this is a regulatory requirement for all oxidative hair dye and is not optional even for experienced users.

The Osijero Herb Color Cream (No. 1, Natural Black Brown) is a permanent cream dye formulated with herbal extracts. Herb color creams are a Korean professional hair product category that blends standard oxidative dye chemistry with plant or herbal additives - often including ingredients like ginseng, camellia oil, or botanical extracts - to reduce the damage and scalp sensation associated with standard ammonia-based dyes. Natural Black Brown (No. 1) is a very deep dark brown that reads as near-black - a popular shade for gray coverage that avoids the flat, harsh look of pure black. The cream consistency makes it easier to apply uniformly compared to liquid formulas.

The LCK Speed Magic Straight (500ml) is a professional permanent straightening cream in a large-format supply size. Permanent straightening (also called a "magic straight" or Japanese straight perm in Korean salon terminology) uses a two-step chemical process: a thioglycolate or similar reducing agent breaks the disulfide bonds in the hair's cortex, allowing the hair shaft to be physically straightened, followed by a neutralizer that re-forms those bonds in the new straight configuration. The "Speed" positioning indicates a faster processing version, reducing the time the chemical is in contact with the hair.

At 500ml this is a professional supply size for multiple applications. Permanent straightening is one of the most structure-altering chemical services available for hair - it carries significant breakage risk on pre-bleached, highly damaged, or fine hair. Professional application is strongly recommended for first-time users. The 500ml size is practical for salons or for households in which multiple family members use the service.

Sewha P&C's Sehwa line products are professional salon-grade formulations available for purchase by consumers. Using them at home is possible but carries more risk than using consumer-grade products because the concentrations are higher and the application sequences are more exacting. Key safety practices for at-home use: always perform an allergy test 48 hours before any oxidative color or permanent treatment; always strand-test to check color result and hair integrity before full application; work in a well-ventilated space; use protective gloves; follow timing instructions exactly. Bleaching and permanent straightening in particular should be done conservatively, with professional consultation for anyone attempting them on significantly processed or damaged hair.

The Sehwa bleach powder and hair dye products require developer to activate - developer is sold separately and is not included in the listings. For bleach: use 20 vol developer for gentle lift on pre-lightened or fine hair; 30 vol for standard lift on natural hair; 40 vol for maximum lift on resistant dark hair. Mix at a 1:1.5 or 1:2 powder-to-developer ratio depending on consistency preference. For the dyes: standard permanent cream dye typically mixes 1:1 with 20 vol developer. The Speed Magic Straight requires a separate neutralizer step; check the full product instructions for the correct neutralizer product and timing.