Difference between semi and demi permanent hair dye
Hair dyeing has become a popular way to express one’s personal style and experiment with different looks. When it comes to hair coloring, there are various types of dyes available, each with its own unique characteristics and effects. Two of the most common types of hair dyes are semi-permanent and demi-permanent hair dyes. While they may seem similar, there are several key differences between the two that can significantly impact your hair coloring experience.
Semi-Permanent Hair Dye
Semi-permanent hair dye is designed to last for several shampoos, typically around 25-28 shampoos. It does not penetrate the hair shaft but rather coats the outer layer, or cuticle, of the hair. This means that the color will fade gradually as you wash your hair, and it will not change the natural color of your hair completely. Semi-permanent hair dye is a great option for those who want to experiment with a new color without making a long-term commitment. It is also suitable for people with fine or damaged hair, as it is less harsh on the hair compared to permanent hair dye.
Demi-Permanent Hair Dye
Demi-permanent hair dye, on the other hand, is a bit more intense than semi-permanent dye. It contains a small amount of ammonia, which allows it to penetrate the hair shaft slightly and deposit color molecules. This means that demi-permanent hair dye can provide a more vibrant and longer-lasting color than semi-permanent dye. It can last for up to 4-6 weeks, depending on the individual’s hair type and the frequency of washing. Unlike permanent hair dye, demi-permanent dye does not lift the natural color of your hair, making it a great option for covering gray hair or adding dimension to your hair color.
Key Differences
1. Penetration: Semi-permanent dye coats the hair cuticle, while demi-permanent dye penetrates the hair shaft slightly.
2. Color Duration: Semi-permanent dye fades gradually with each wash, lasting for 25-28 shampoos, while demi-permanent dye can last for 4-6 weeks.
3. Ammonia Content: Semi-permanent dye has no ammonia, making it gentler on the hair, while demi-permanent dye contains a small amount of ammonia.
4. Effectiveness: Semi-permanent dye is ideal for temporary color changes or subtle highlights, while demi-permanent dye is better for vibrant colors and covering gray hair.
In conclusion, the main difference between semi and demi permanent hair dye lies in their penetration, color duration, ammonia content, and effectiveness. When choosing between the two, consider your desired outcome, hair type, and the level of commitment you are willing to make to your new hair color.
