Final answer:
The technique of decolorizing specific hair strands is called highlighting. It involves lightening selected strands of hair for contrast and dimension.
Step-by-step explanation:
The technique of decolorizing specific hair strands is called highlighting.
Highlighting is a hair coloring technique where selected strands of hair are lightened to create contrast and dimension. This is usually done using a bleaching agent or hair dye to lighten the hair.
Other options mentioned in the question are not applicable to decolorizing specific hair strands. Balayage involves hand-painting highlights onto the hair for a natural, sun-kissed look. Ombre is a technique where the hair transitions from one color to another. Perming is a method of creating permanent curls or waves in the hair.