TransTint Dyes, Blue

I just purchased dark walnut for a strat body and dark vintage maple for the maple neck. how much dye and water/alcohol should be used for each part?

Can I use this to even out color over wood that I oil stained and looks blotchy?

I need to darken tile grout. Can I mix this in a water based tile sealer?

Can I tint linseed oil with this?