I see....

.... I've been meaning to ask for a while...

How did you disguise your hair back then?

Ah, you mean this?

It's a special kind of dye, you see. It usually appears transparent...

But in case of emergency, it will apply heat and turn the hair color into blonde in an instant.

It's useful when I need to disappear, but there are also disadvantages...

Like how it will return to transparent after a long period of time?

Exactly. It can leave spots on my hair if I become impatient.