“No direct cosmetic skin-benefit evidence; supports Bromothymol Blue as a halochromic sulfonphthalein dye for visible pH-dependent color change around skin-relevant near-neutral pH.”
Bromothymol Blue
Cosmetics
Code: 35660
synthetic dye that use in cosmetics for pH indicator and Color-changing cosmetics
pH 6 = yellow, pH 7.6 = blue
Bromothymol Blue is a synthetic dye that use in cosmetics. Here are some key points about the use of Bromothymol Blue in cosmetics:
- pH indicator: Bromothymol Blue is a halochromic compound, which means it changes color based on the pH of the solution it's in. This property makes it useful as a pH indicator in cosmetic products, particularly in products that require a specific pH range for optimal performance or skin compatibility. pH 6 = yellow, pH 7.6 = blue
- Color-changing cosmetics: Bromothymol Blue can be used to create cosmetic products that change color in response to changes in pH. For example, it can be used in lipsticks, lip glosses, or other makeup products that change color based on the wearer's skin pH, providing a unique and customized look.
Use: for all kinds of products containing water
Mixing method: Mix in water (water-phase)
Usage rate: Used in very small quantities because the color is highly concentrated Put a little at a time until you get the desired color.
Product characteristics: color powder
Solubility: can dissolve in water
Storage: For long term storage Store at room temperature Do not expose to sunlight, heat, seal the lid tightly, the shelf life is at least 5 years.
INCI Name : Bromothymol Blue
- Room (25-40C)
- 60 Months from manufacturing or testing date.
- 0.01% - 0.10%
- 0.00%
- Add into water phase. Avoid temperature above 60C.
- Heat Tolerant
- 3.00 - 7.00
- Soluble in Water
- Cream, Lotion, Lip
- -
| Test Name | Specification |
|---|---|
| Appearance | Purple color powder |
| Mass absorption coefficient (L/cm . g) | 52 Min |
| Ethanol solubility test | To Conform to standard |
| Residue on Ignition (Sulfated Ash) | 0.3% Max |
“No direct skin-active benefit; confirms Bromothymol Blue pH-dependent molecular forms and absorption changes that justify pH-indicator/color-changing cosmetic use.”
“Closest skin-contact evidence: Bromothymol Blue retained pH-indicator function in a wearable microfluidic device for real-time sweat pH monitoring; this supports diagnostic/color-sensing use, not a biological skin benefit.”
“Closest wound/skin-contact evidence: Bromothymol Blue-loaded nanocellulose dressings enabled rapid non-invasive wound pH monitoring; benefit is monitoring wound status, not treating skin.”
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