Demi Dye Dyeing Deep
<p>This collection gathers DEMI's deep-coverage hair dye shades, the colours built to settle grey and saturate the strand for a result that reads natural rather than flat. You will find both the at-home <strong>Satch Cover</strong> sachets and the salon-style <strong>Assalt Arias Deep Natural</strong> line here, spanning the D-4 through D-9 numbering.</p><p>DEMI is a Japanese hair-care house, and the Deep Natural family leans into the kind of low-contrast, true-to-life colour that Japanese salons favour. Each shade carries a two-letter suffix such as BB, WB or CB that signals its undertone, so you can match a cool ash or a warmer base without guessing.</p>
By Skinsli editorial Updated
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Buying guide
DEMI Deep Natural hair dye: a shade-matching guide
The Deep Natural shades from DEMI are made to cover grey thoroughly while keeping the finished colour believable. This guide walks through how the line is structured, what the shade codes mean, and how the two product formats differ so you can pick the right box or sachet for your hair.
What the Deep Natural line is
Deep Natural is DEMI's grey-coverage tier. Where a brightening dye lifts and lightens, these shades are formulated to deposit rich pigment that fills in resistant grey and leaves an even tone from root to tip. The word deep in the name points to that saturation, and natural signals that the goal is a colour close to a real head of hair rather than a high-fashion finish.
Reading the D-number and the suffix
Every shade carries a D-number, here ranging from D-4 to D-9. Lower numbers sit on the darker, cooler end and higher numbers move toward warmer or lighter browns. After the number comes a two-letter suffix. BB tends to read as a brown-black or neutral brown, WB as a warmer brown, and CB as a cooler or ash-leaning brown. Pairing the number with the suffix lets you target both depth and undertone.
The Satch Cover sachet format
The Satch Cover items are sachet-based dyes aimed at quick touch-ups and at-home use. They are convenient for refreshing roots between full colours and for anyone who prefers a smaller, single-use portion rather than a full salon kit. Look for the Satch Cover Hair Satch Dyeing Deep Natural labels in this group.
The Assalt Arias salon line
The Assalt Arias Deep Natural Line is the more salon-oriented set, offering a broader spread of D-numbers and suffixes for precise mixing and matching. If you colour with a stylist or want finer control over the final tone, this is where the wider shade range lives. It shares the same Deep Natural coverage philosophy as the sachets.
Choosing warm, cool or neutral
Undertone is the part most people skip, and it is what separates a colour that flatters from one that fights your complexion. If your current colour tends to pull brassy, a cooler CB shade can calm that down. If you want warmth and dimension, a WB shade leans golden. BB sits in the middle and is a safe pick when you simply want grey gone without a strong cast.
Matching depth with the D-number
Depth is the lightness or darkness of the result. The D-5 to D-7 range is a practical zone for most medium-brown hair, while D-8 and D-9 move lighter and D-4 sits darker. When you are between two numbers, going one step darker usually reads more natural on grey because grey hair can grab pigment unevenly and look lighter than expected.
Patch testing before you colour
Before any new dye, run a small patch test behind the ear or on the inner arm and wait the full window stated on the box. This applies whether you use a Satch Cover sachet or an Assalt Arias kit. Skin can react to colourants even if you have dyed before, so a fresh test each time is the cautious habit.
Keeping the colour looking fresh
After colouring, a sulphate-gentle shampoo and cooler rinse water help the deposited pigment last. Grey regrowth shows first at the parting and temples, so a sachet touch-up there can stretch the time between full applications. Storing any unused product sealed and away from heat keeps it usable for the next round.
FAQ
Frequently asked questions
FAQ
Frequently asked questions
What does DEMI's Deep Natural line do differently?
Deep Natural is DEMI's grey-coverage range. The shades deposit rich pigment to fill in resistant grey and hold an even tone, aiming for a believable colour rather than a bright or fashion finish. Both the Satch Cover sachets and the Assalt Arias kits in this collection share that coverage focus.
What do the BB, WB and CB suffixes on DEMI shades mean?
The two-letter suffix signals undertone. BB reads as a brown-black or neutral brown, WB leans warmer and more golden, and CB sits cooler or more ash. Pairing the suffix with the D-number lets you choose both the depth and the warmth of the result.
How do the D-4 to D-9 numbers work?
The D-number sets depth. Lower numbers like D-4 are darker, and the range climbs toward lighter browns at D-8 and D-9, with D-5 to D-7 covering most medium-brown hair. When you are unsure between two numbers, the darker one usually reads more natural on grey.
What is the difference between the Satch Cover and Assalt Arias products?
The Satch Cover items are sachet dyes suited to quick at-home touch-ups and root refreshes. The Assalt Arias Deep Natural Line is the more salon-oriented set with a wider spread of D-numbers and suffixes for precise matching. Both deliver the same Deep Natural coverage.
Should I patch test before using a DEMI dye?
Yes. Run a small patch test behind the ear or on the inner arm and wait the full time stated on the packaging, even if you have used hair dye before. Skin can react to colourants at any point, so a fresh test each time is the safer routine.
Which Deep Natural shade covers stubborn greys best?
For resistant grey, a mid-depth shade in the D-5 to D-7 range with a neutral BB suffix is a reliable starting point, since BB deposits enough pigment to hide grey without a strong cast. If your grey grabs colour unevenly and looks lighter than expected, stepping one D-number darker often gives more even coverage.