Sewha P&c

SEWHA P&C (Sehwa P&C) is a Korean professional hair care brand established in the salon supply market. "P&C" likely references professional and cosmetic or professional and care positioning. The product naming is practical and trade-focused: bleach powder is labeled High Bleach, the dye lines carry numeric color codes (No. 7 Natural Black, No. 1 Natural Black-Brown), and the straightener is Speed Magic Straight - names that communicate function directly to salon professionals. The brand is stocked at skinsli for customers who want Korean professional-grade hair color products for home use.

The SEWHA P&C High Bleach Powder (500g) is a professional-grade lightening powder for hair bleaching. At 500g it is a salon-scale quantity - a 500g tub covers many full-head bleaching sessions or multiple applications, making it cost-effective for regular use. Bleach powder is mixed with developer (oxidizing cream) in a ratio determined by the desired lift level - higher developer volumes produce faster, more dramatic lightening. "High Bleach" implies a formula capable of significant lift, suitable for pre-brightening before vivid color, going platinum, or lightening dark bases substantially. Professional bleach requires careful patch-testing, precise timing, and monitoring to avoid over-processing.

The LCK Speed Magic Straight (500ml) is a chemical hair straightening treatment. "Speed Magic" indicates a fast-acting formula - professional straightening creams at speed settings reduce the processing time required compared to standard systems. The 500ml bottle is a professional supply size for salon use or for multiple at-home treatments. Chemical straightening works by breaking the disulfide bonds in the hair shaft (the bonds that create natural curl or wave), restructuring them in a straight position, then neutralizing the treatment to lock the new shape. SEWHA's Speed Magic system follows this standard two-step process. Proper timing is critical - leaving the cream on too long causes structural damage; removing too early produces incomplete straightening.

The SEWHA P&C Satchcolor Hair Dye (No. 7 Natural Black) is a permanent cream color in the Satchcolor professional line. In Korean and international hair color numbering, shade 7 is a medium level - "7 Natural Black" sits at the darker end of the brown-to-black spectrum, providing rich, true coverage on gray hair and a natural-looking dark result rather than a harsh blue-black. Permanent cream dyes open the hair cuticle, deposit pigment, and close again for long-lasting color that grows out at the roots rather than washing away. The Satchcolor line is designed for professional blending and consistent results across multiple applications.

The Osijero Herb Color Cream (No. 1 Natural Black-Brown) is the second permanent dye line in the SEWHA P&C range, differentiated by its herb-enriched formula. "Herb" in Korean professional dye products typically indicates botanically-derived buffering agents - plant extracts that reduce the harshness of the peroxide process and condition the hair during coloring. No. 1 Natural Black-Brown is the deepest shade in the Osijero range, sitting between a pure black and a very dark brown - a natural color that reads as almost black with slight warmth. The herb formula makes it a better choice for hair that has been previously colored or damaged, where a gentler oxidation process helps maintain integrity.

All SEWHA P&C chemical products - bleach, straightener, and permanent dyes - require a patch test before first use and after any gap in use. Mix a small amount of the product as directed, apply to the inner elbow or behind the ear, and leave for 48 hours. Check for redness, itching, burning, or swelling. If any reaction occurs, do not proceed with the full application. Allergic reactions to hair dye peroxide and colorant compounds can range from contact dermatitis to severe systemic reactions; a 48-hour patch test is the only safe verification method. The Korean cosmetic label instructions on every SEWHA P&C dye product include this requirement.

The two SEWHA dye lines serve different hair states. Satchcolor No. 7 Natural Black is the standard professional permanent color best suited to virgin (uncolored) or minimally treated hair where a full-coverage professional result is the goal. Osijero Herb Color Cream No. 1 Natural Black-Brown is designed for hair that benefits from gentler treatment - previously colored hair, bleach-lifted hair, or fine hair that needs conditioning support during the color process. If your hair is in good condition and you want precise professional color, Satchcolor is the direct choice. If your hair is compromised or you want to add a botanical gentleness to the process, Osijero's herb formula is the safer pick.

Professional-grade bleach and chemical straightening require careful preparation. Use gloves throughout any application. Mix bleach powder with the correct developer cream (not included, sourced separately) in a non-metallic bowl - metal reacts with peroxide. For the Speed Magic Straight, apply to clean, dry hair in sections, working from the mid-lengths to avoid over-processing the more fragile ends. For hair dye, apply to dry (not shampooed that day) hair, starting at the roots where color lift is slower. Rinse thoroughly and follow with a color-safe conditioner to close the cuticle. Do not combine bleach and straightener in the same session without a recovery interval of at least two weeks.