Do you ever find yourself looking at color swatches and not know what the heck all those letters and numbers mean. Here's a little handy dandy break down to make things easier:
Any color code that ends in RT8 or RT4 means it has a dark roots
The tipped colors are the ones that start with RT like the RT613/27 or RTH613/27 or RT27/30
There is another tipped color that ends in BT, like the R24/18BT.
RT330RT4 is both tipped and rooted.
The ombres colors start with ROM but are not technically tipped, but do sort of have that same tipped appearance. Some ROM colors do also have a root and do end with "RT4"