Final answer:
SoColor Blended and Reflect Collections are typically mixed with a Matrix cream developer at a 1:1 ratio, and the volume of developer chosen depends on the desired level of lift or deposit.
Step-by-step explanation:
When using SoColor Blended Collection and Reflect Collection, the developer mixed with the color is typically a Matrix cream developer. The developer comes in different volumes, such as 10 volume (3%), 20 volume (6%), 30 volume (9%), and 40 volume (12%), which are selected based on the desired level of lift or deposit.
It is crucial to follow the manufacturer's instructions for the proper ratio of color to developer. Generally, the mixing ratio for SoColor hair color with the developer is 1:1, meaning equal parts of SoColor and developer. For the Reflect Collection, which includes more vibrant shades, the developer used should be chosen according to the level of vibrancy and longevity desired for the color.