Demi Dye Arias Natural

The D number is the depth level on a 1-to-10 scale. D-4 is a dark brown, D-5 is a medium dark brown, D-7 is a medium brown, D-8 is a light medium brown, and D-9 is a light brown. Higher D numbers mean lighter results. Most clients wanting a natural brown fall in the D-5 to D-7 range.

WB (Warm Beige) adds golden warmth and works well on olive or warm skin tones. CB (Cool Beige) is an ash-leaning neutral that reduces brassiness in the result. BB (Bright Beige) sits between the two, delivering a clean luminous brown without a strong warm or cool direction. All three are available at D-5 and D-7 in the current in-stock range.

The Deep Natural Line provides reliable gray coverage at standard developer concentrations. At darker depths (D-4 to D-7), solid coverage is achievable with a 1:1.5 ratio and a 30-minute process. For very resistant gray or coarse texture, adding gentle heat and extending processing by five minutes improves results. At lighter depths (D-8, D-9), high white-hair concentrations may produce a softer, blended finish rather than a complete mask.

For tonal deposit and gray coverage without lift, use DEMI's 3% (10 vol) developer at a 1:1.5 ratio. If modest lift alongside color deposit is needed, 6% (20 vol) is the maximum recommended within the Deep Natural tone family. Higher developer concentrations risk shifting the pigment away from the natural beige axis and producing an unwanted warm or brassy cast.

DEMI Assalt Arias is a professional-grade Japanese color line designed for salon use. The mixing ratios, developer selection, and processing times require familiarity with oxidative color systems. Home use without professional experience risks uneven results and scalp sensitivity. If you are not a trained colorist, it is strongly recommended to have this applied by a professional who has experience with Japanese color systems.

Standard processing time is 30 minutes at room temperature without heat, or 20 minutes with a moderate heat source such as a salon dryer. Do not exceed 40 minutes under any circumstances, as extended processing beyond the formula's window does not improve results and may increase scalp sensitivity or shift the tone unpredictably.

The standard ratio is 1 part color to 1.5 parts developer. Some colorists use a 1:2 ratio to improve spreadability on thick or coarse hair, but the richer 1:1.5 ratio gives fuller pigment deposit, which is preferable for the Deep Natural family's saturated result.

Japanese professional color like DEMI typically uses lower ammonia concentrations and higher conditioning agent inclusion compared to many European lines. The result is a softer, shinier finish on the hair and lower odor during processing, but lower lift capacity. If your client needs more than two levels of lift alongside color deposit, a European line may be the more practical tool. For natural brunette deposit and gray coverage, DEMI's depth and shine characteristics are a genuine advantage.

D-4 is the darker of the two and sits at the boundary between dark brown and near-black. It is the right choice for clients who want the darkest natural brown without crossing into black territory, or for those with a very high percentage of gray needing deep coverage. D-5 reads as a medium dark brown with more visible warmth or coolness from the tone suffix, giving more flexibility for adjusting the result on subsequent visits.

Yes. As with all oxidative hair dye systems, a patch (allergy) test is required 48 hours before first use and recommended before every application if the client has not been colored in more than three months. Apply a small amount of the mixed formula to the inner elbow and observe for redness, itching, or swelling. If any reaction occurs, do not proceed with the application.

Opened color tubes should be sealed tightly after each use and stored at room temperature away from direct light. An opened tube is best used within four to six weeks; beyond that, oxidation can alter the pigment and affect the mixing consistency. Unopened tubes have a longer shelf life when kept at stable room temperature, typically 24 to 36 months from the manufacture date printed on the tube.

DEMI is a Japanese cosmetics brand and all products in the Assalt Arias line are manufactured in Japan. Japanese hair color manufacturing operates under the Japanese cosmetics regulatory framework, which requires ingredient safety testing and adherence to domestic cosmetic law before products can be sold and exported.

WB (Warm Beige) variants at D-5 or D-7 are the most complementary to warm and olive skin tones. The golden undertone in WB echoes the skin's natural warmth rather than contrasting against it, which creates a more harmonious overall look. D-5 WB is a particularly popular choice because the darker depth amplifies the warmth perception on lighter and medium skin tones.