Final answer:
Hair coloring should not exceed the pale yellow stage with lightener to avoid damaging the hair. The pale yellow stage represents the lightest stage before the risk of hair damage increases significantly.
Step-by-step explanation:
Hair cannot be safely lifted past the pale yellow stage with lightener. When lightening hair, it is important to understand that the hair goes through various stages of color lifting.
These stages typically start from the darker undertones and gradually lightening to orange, gold, and finally a pale yellow, which is the lightest stage before the hair becomes too compromised to lift further without risking severe damage or breakage. Attempting to lift past this pale yellow stage can lead to damaged, overly porous, and brittle hair.