Hair Structure, Shampoo, and Dye

What is the natural pH level of hair?

• pH level between 4.5 - 5.5

• pH level between 6.5 - 7.5

• pH level between 3.0 - 4.0

• pH level between 8.0 - 9.0

Which type of hair dye lasts the longest?

• Permanent Hair Dye

• Semi-Permanent Hair Dye

• Temporary Hair Dye

• Wash-Out Hair Dye

What is a key characteristic of semi-permanent hair dye?

• It coats the surface of the hair and fades after 8-10 washes.

• It permanently changes the hair color.

• It requires a developer to activate.

• It lasts for several months without fading.

Which type of hair dye is most suitable for a short-term change for a special occasion?

• Temporary dye

• Permanent dye

• Semi-permanent dye

• Demi-permanent dye

What is a unique feature of natural hair dyes like henna?

• They are a chemical-free option but results may vary.

• They provide instant color change.

• They are permanent and cannot be washed out.

• They are only available in black color.

What makes demi-permanent dye different from semi-permanent dye?

• It lasts longer and opens the hair cuticle slightly.

• It contains ammonia and requires a developer.

• It is completely permanent and cannot be washed out.

• It is only available in natural colors.

What is the primary effect of bleaching on hair?

• Strips the hair of its natural pigments and causes structural changes.

• Makes the hair grow faster and thicker.

• Adds natural oils to the hair, making it shinier.

• Strengthens the hair by adding protein.

Which microscopic feature is commonly observed in bleached hair?

• Lifted or fragmented cuticle layers.

• Intact and smooth cuticle layers.

• Increased melanin concentration.

• Thicker hair shaft.

Which of the following techniques can accurately distinguish between bleached and dyed hair?

• Infrared Spectroscopy

• Ultraviolet Light Analysis

• Electron Microscopy

• X-ray Diffraction

What pigments does Phaeomelanin produce in the hair?

• Black and brown

• Red and yellow

• Blue and green

• White and gray