Hair Paint MNL Purple Shampoo and Conditioner

I am finally at that hair level that requires purple/silver shampoo :0 It took quite a while to tak the leap from blonde-ish (brownish with blonde highlights) to blond proper since my hair is quite damaged but I've been blonde for a few months now.

But legit question: what is the threshold for blondeness?

There is probably a better way to measure it, but I know I've hit legit blonde since my hair looks like a broom without special shampoo. It doesn't look good at all  の 。の

I was wondering what to get to tone my hair and ended up with Hair Paint MNL's Purple Shampoo, Purple Conditioner and Keratin Mask.