Hi Hendrik,
The sample is sent to the factory. They put it under a microscope to determine the exact color and tints in your hair sample. If your hair sample is between 2 or more colors the factory will blend the two colors in whatever percentage your hair sample is. The factory would like a hair sample that is a clump about 1” long and the diameter of a pencil. Many people can’t do that much so just do the best you can. Please send the hair sample (and template is you’re ordering a custom unit) to:

TOPLACE USA
PO BOX 577
WAYZATA, MN 55391
USA

888-986-7522

Thanks,
John