What is the fine-grained topic of the following text: The ingredient is activated when the stylist blows out the hair and uses a flat iron to achieve the shiny texture appearance, and so if a product is promising zero traces of Formaldehyde (or any -aldehyde) than it won’t stay in your hair for much longer than the next wash. Lasio’s brand of BKT contains .02 percent of Methylene Glycol, and most usually will contain between .02 and .04 percent in their keratin products. Only return the topic.
Formaldehyde content in keratin hair products