The Science of Hair Coloring: Effects on Hair Structure

The Science of Hair Coloring: Effects on Hair Structure

Learning Objective

Understand the impact of hair coloring on the hair structure and its implications for hair health.

What do you already know about the effects of hair coloring on the hair structure?

Understanding Hair Structure

Hair is composed of three layers: the cuticle, cortex, and medulla. The cuticle is the outermost layer that protects the inner structure of the hair.

Which part of the hair structure provides strength and elasticity?

1. Cortex
2. Hair bulb
3. Cuticle
4. Medulla

Where is the innermost part of the hair structure located?

1. Hair follicle
2. Medulla
3. Cortex
4. Cuticle

What is the outermost part of the hair structure?

1. Cuticle
2. Cortex
3. Medulla
4. Root sheath

Effects of Hair Coloring

Hair coloring involves chemical processes that can penetrate the cuticle layer and alter the natural pigment in the cortex, leading to a change in hair color.

Damage to Hair Structure

Repeated coloring can weaken the cuticle, causing hair to become brittle and prone to breakage. It can also affect the natural moisture balance of the hair.

Protecting Hair Structure

Using quality hair care products and minimizing the frequency of coloring can help in maintaining the integrity of the hair structure.

Interactive Experiment

Demonstrate the effects of hair coloring on a sample of hair under a microscope to observe the structural changes.

Healthy Coloring Practices

Choose ammonia-free and gentle hair coloring products to minimize damage to the hair structure. Consider professional application for best results.

Review and Discussion

Summarize the key points about the effects of hair coloring on the hair structure and encourage discussion on best practices for maintaining hair health.

Write down 3 things you learned in this lesson.

Have students enter three things they learned in this lesson. With this they can indicate their own learning efficiency of this lesson.

Write down 2 things you want to know more about.

Here, students enter two things they would like to know more about. This not only increases involvement, but also gives them more ownership.

Ask 1 question about something you haven't quite understood yet.

The students indicate here (in question form) with which part of the material they still have difficulty. For the teacher, this not only provides insight into the extent to which the students understand/master the material, but also a good starting point for the next lesson.