this is on that older Investarms kit you're working on? That wood may not show up much figure with aqua fortis, some of those were fairly plain-grained (straight-grained) woods like beech. Definitely try it out in an inconspicuous area first to get an idea.
It won't look bad, but may disappoint you a bit if you're expecting something more. There are ways to get 'faux' figure, if you want to get creative. Search on here, and other places, will show options. It might not be a tiger-striped maple stock, but can be a bit more interesting.