Every piece of wood takes colors differently, so take the scraps from the top, and practice the colors on it. Otherwise, you can end up with orange tints, or even green-ish tints...
The only thing I trust as a toner, after playing with the available dyes, is plain old orange shellac. It has a wonderful amber tone to it, and it doubles as your sealer coats. Just mist a light, light coat on the top, wait a few minutes for it to flash off, and repeat until you acheive the desired color.
The spruce will age on its own, so do go too drak. How deep you build the color at this point depends on what your top coats will be. If you use nitro lacquer, keep in mind that it, too, will yellow with age, quite a lot, too, so again, don't go too dark. If you're using a waterborn, you can go a bit deeper with the toner.
I don't like any toner at all in the top coats, because you then have to be super careful to keep everything even when sanding and buffing, and it makes drop fills and future repairs all that tougher. Put the color lightly on the wood(seal first if you're worried), then shoot the clear.
Whatever you do, do NOT apply any toner, orange shellac or otherwise, by hand on spruce. Most blotchy....
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