Demi Dye Arias Line

These codes indicate tone direction within a depth level. WB stands for Warm Brown, which produces golden or amber undertones. CB means Cool Brown, which pulls toward ash and neutralizes warmth - a popular choice for gray coverage clients wanting a modern, muted finish. BB is Beige Brown, a balanced mid-tone that sits between warm and cool without strong tonal bias. All three codes appear across depth levels D-5, D-7, and D-8 in this collection.

In the DEMI Assalt system, the D-level maps roughly to the standard European depth scale: D-4 is a medium-dark brown, D-5 is medium brown, D-6 is a light-medium brown, D-7 is light brown, D-8 is a light blonde-brown, and D-9 approaches light blonde territory within the natural tone range. On naturally dark hair (Level 3 or 4), you will need higher developer volume to fully express D-8 and D-9 depth.

Yes, for D-4 through D-7 shades, full gray coverage is achievable within the standard 35-45 minute development time using 20-volume developer. For D-8 and D-9 on clients with high-density white hair, extending processing by 5-10 minutes or using 30-volume developer improves coverage. CB tone variants are often preferred for gray coverage because they counteract the natural yellowing that white hair can develop under warm-toned dyes.

Developer choice depends on your target depth and starting base. For darkening or same-depth coloring, 10-volume (3%) is sufficient and causes minimal additional cuticle lift. For lifting 1-2 levels or covering resistant gray, use 20-volume (6%). For applications targeting D-8 or D-9 on naturally dark hair (Level 3-4), 30-volume (9%) developer is recommended. DEMI specifies 1:1 mixing by weight in most Assalt line products - always check the package insert for the specific ratio for each shade.

Yes. Shades within the same DEMI product line are designed to mix predictably. Mixing adjacent depth levels (e.g., D-6 and D-7 in equal parts) produces an intermediate depth that does not exist as a catalog shade. Blending WB and BB at the same depth creates a warm-beige tone with more dimension than a single shade alone. Mixing CB and BB at equal parts gives a cool-leaning beige preferred by some colorists over pure CB. Do not mix Arias with shades from unrelated DEMI color series - different base chemistry can behave unpredictably.

At room temperature (approximately 20°C/68°F), processing takes 35-45 minutes. Under a heat cap or gentle salon heat, this can be reduced to 25-35 minutes. DEMI does not recommend exceeding 45 minutes of processing time, as over-processing can cause unnecessary damage to the hair shaft without improving color uptake. For re-growth applications on already-colored ends, apply to roots first, then pull through ends for only the final 10 minutes of processing.

WB (Warm Brown) shades fade slightly warmer as cooler pigments leave the hair first, which some clients find attractive. CB (Cool Brown) shades can develop a greenish cast on lighter bases as they fade, so a toning treatment at the four-week mark helps maintain the intended tone. BB (Beige Brown) fades the most neutrally, making it a low-maintenance choice for clients who space appointments four to six weeks apart. Regular use of color-protecting shampoo slows the fade rate by 30-50% compared to sulfate-heavy formulas.

Yes. DEMI Cosmetics is a Japanese professional haircare and color brand. Its Assalt product lines are formulated and manufactured in Japan under Japanese cosmetic safety regulations. DEMI products sold on skinsli.com are sourced from Korean B2B wholesale channels, which carry a significant selection of Japanese professional salon brands alongside Korean beauty products.

Yes, and it is a particularly good choice for virgin hair because the closed, intact cuticle accepts oxidative color evenly. Virgin dark hair targeting D-4 or D-5 will achieve the natural tone without significant lightening - the result looks rich and dimensional. For virgin hair targeting D-8 or D-9, some pre-lightening may be necessary to fully express the lighter depth, as these shades have limited lift capacity on their own.

Partially used tubes can be stored for up to two weeks if the cap is re-sealed tightly immediately after use and the tube is kept in a cool, dark place. Squeezing out excess air before re-capping reduces oxidation. Mixed color (dye plus developer) cannot be stored and must be discarded after use. If you notice the color in the tube has darkened or thickened significantly compared to when first opened, discard it - oxidation has already affected the formula.

Yes. DEMI and all professional oxidative hair dye manufacturers recommend performing a skin sensitivity test 48 hours before each application, even for clients who have used the product before. Apply a small amount of the mixed formula to the inner elbow or behind the ear, leave for 30 minutes, then rinse. If redness, itching, or swelling develops within 48 hours, do not proceed with the full application. PPD (p-phenylenediamine) or related compounds in oxidative dyes are a common source of allergic reactions that can intensify with repeated exposure.

DEMI produces multiple Assalt sub-lines targeting different color outcomes. The Deep Natural Line (Arias) is optimized for brown tones with natural depth and covers the D-4 to D-9 range. Other DEMI Assalt lines cover fashion colors, more intense tone saturation, or lighter blond depths. Within the Arias system, the Deep Natural descriptor signals that the palette stays within natural-looking brown territory rather than pushing toward vivid or fashion tones. If you need shades outside the medium-to-light brown range, a different DEMI sub-line would be appropriate.