After pre-lightening, a typical demi-permanent toner is processed for how long, and the operator monitors visually?
a.Overnight
b.5 to 15 minutes at room temperature with frequent visual checks
c.60 minutes covered with a plastic cap
d.30 to 45 minutes under heat
Explanation
Toners are typically demi-permanent or semipermanent products processed 5 to 15 minutes at room temperature, with the operator checking the color development every few minutes because over-processing leads to muddy or undesired tones. Manufacturer instructions always govern exact timing.
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