Lift upto 3 levels, balanced neutrals to allow on tone deposit of previously lightened hair, grey blending (deeper shades 4 and lower seem to cover not just blend) lighter shades 6 and above are excellent for 1st time grey coverage clients- Luocolor is translucent enough that while they are colored it isn't a flat hard color and it grows out rather nicely with out a hard line of demarcation.
We still use an opaque color for complete grey coverage, but Luo has filled in the gaps for toning, grey blending and in some places we used to use a demi. Feel free to PM me for more details if you want them.