DR.RANBOSS KNOWLEDGE
Hair Color Guides
In-depth guides for preparation, application, aftercare, gray coverage and shade selection.
05
Before coloring
Get the product, timing, space and required tests ready before you begin.Why should you repeat the skin allergy test before every coloring?
A product that caused no reaction last time can still cause one today. Sensitivity can change over time, so follow the product’s skin-test instructions before every use.
02A complete checklist before coloring your hair at home
Preparing the product, tools, space and time in advance helps prevent interruptions halfway through application.
03Read the full instructions before opening the product
Mixing methods, processing times and test procedures vary between products, so do not rely only on previous experience.
04Use a small strand test to preview the color direction
A strand test can show the likely tone and how the hair responds, but it cannot guarantee an identical full-head result.
05Will one box be enough? Estimate by length and density
Running short often leads to thinner application near the end and uneven coverage.
06
Application
Understand mixing, sectioning, timing, rinsing and what to do if something feels wrong.How sectioning helps prevent missed areas and uneven color
Divide the hair into manageable areas and follow a consistent order instead of working through large, uncontrolled sections.
02Gloves reduce direct contact—not just staining
Wear suitable gloves as directed during mixing, application and handling before rinsing.
03Ten extra minutes do not make color last longer
Processing time is part of the product instructions. Extending it does not guarantee a better result.
04Stop if you feel stinging, burning or intense itching
Do not treat worsening discomfort as a normal sign that the color is working.
05Do not mix hair colorants from different brands or lines
Similar-looking shades do not mean the formulas or reaction systems are compatible.
06Hair colorants must not be used on eyebrows or eyelashes
Using hair color close to the eyes can cause serious eye injury.
06
Aftercare
Support colored hair through cleansing, detangling and everyday protection.After coloring, rinse thoroughly rather than quickly
Do not reduce rinsing to preserve color, and do not leave residual product on the scalp.
02What do cleansing and conditioning do after coloring?
Shampoo cleanses the scalp and hair, while conditioner mainly improves slip, detangling and feel.
03Wet hair is more fragile—dry and detangle slowly
If colored hair is already dry, rubbing and forceful pulling can worsen frizz and tangles.
04Hotter airflow does not always dry hair better
High heat and very close distance increase moisture loss, so heat control matters after coloring.
05Sun, pools and repeated heat can dry colored hair
Environmental effects accumulate, so everyday protection matters more than one intensive treatment.
06How to reduce overlap during a root touch-up
A touch-up targets new growth; it does not mean recoloring previously treated lengths every time.
04
Gray hair & color
Understand gray-hair changes and shade differences before setting color expectations.Why does hair gradually turn gray?
Gray hair is mainly linked to a gradual reduction in pigment production, with age and genetics often playing important roles.
02How should gray-hair percentage influence shade choice?
First decide whether your priority is gray coverage or a clearly visible brown or red tone.
03Natural Black, Black Tea, Brown Black and Chestnut Brown
Shade names describe a tonal direction; they do not promise an identical result on every person.
04What if gray hair seems to increase suddenly?
Gray hair often increases gradually with age. If the change is sudden and accompanied by other symptoms, do not rely only on coloring to hide it.