Hairdressing trainees must learn ratio in order to carry out several operations;
Mixing colour, there are several ratios used for different manufacturers. Igora for instance use a 1:2 ratio for high lift and 1:1 ratio for normal colouring.
Diluting peroxide, if you find yourself with say 40 volume peroxide (12%) and need 20 volume (6%) we would use a ratio of 1:1 but you need to be able to calculate this.
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Multiplication and division.
It varies which means that it depends on what type of ratios are used
They are called equivalent ratios.
It allows the ratios to be compared more easily. But they are NOT all defined as unit ratios. My monitor has an aspect ratios of 4:3 or 16:9.
yes