What is the Difference Between Alkaline Perm and Acid Perm?

The main difference between an alkaline perm and an acid perm lies in their chemical composition, pH balance, and the type of hair they are suitable for. Here are the key differences:

Alkaline Perm:

• Active ingredient: Ammonium thioglycolate
• pH balance: Between 8.2 and 9.6
• Suitable for: Coarse, thick, or resistant hair, as well as normal virgin hair
• Processing time: Shorter, around 20 minutes
• Strength: Stronger, and can be more damaging to hair
• Also known as a "cold perm" or "cold wave" because it doesn't require heat

Acid Perm:

• Active ingredient: Glyceryl monothioglycolate
• pH balance: Between 4.5 and 7.0
• Suitable for: Fine-textured hair, chemically treated hair, or hair exposed to heated styling
• Processing time: Longer than alkaline perms
• Strength: Gentler, less damaging to hair
• Requires heat to activate

In summary, alkaline perms are stronger and suitable for coarse or resistant hair, while acid perms are gentler and ideal for fine-textured or chemically treated hair. Acid perms require heat for activation, whereas alkaline perms do not.

Comparative Table: Alkaline Perm vs Acid Perm

The main differences between alkaline and acid perms are the active ingredients, pH balance, strength, and the type of hair they are suitable for. Here is a comparison table highlighting the differences:

Alkaline perms use ammonium thioglycolate as the active ingredient and have a pH balance between 8.2 and 9.6, making them stronger than acid perms. They are suitable for coarse and thick hair and do not require heat to set. However, alkaline perms can cause hair damage due to the strong chemicals used.

On the other hand, acid perms use monothioglycolate as the active ingredient and have a pH balance between 4.5 and 6.5, making them gentler than alkaline perms. They are suitable for fine and damaged hair and require heat to set. Acid perms can sometimes cause allergic reactions.