There's recipes from Twigs for colored packed silt, and there's recipes for all colors except black. Generally it should be 8 packed silts with the dye in the middle.

Here's an example of an orange packed silt recipe:

I can confirm this, the black packed silt recipe is missing from my server's default.

pack version : All the Mods 9-0.2.60

N1nn1/twigs#16