Can I soak eggs in something to make them sink into the dye better? I've been industriously dyeing Easter eggs, but apparently not industriously enough, because the eggs have started to have trouble sinking into the dye - they're just a bit too old at this point. 

I got to thinking, though: given that I was never intending to eat these eggs anyway — once they're dyed, I blow out and discard the innards, since the dyes I use are not food-safe —, and given that what causes older eggs to start floating in water is that they have a larger air pocket than fresh eggs, then if there were some way to reverse the drying-out that led to that larger air pocket, then the eggs should start sinking better, shouldn't they? 

So, can I soak the eggs in something to "revive" them? (Again, not for eating purposes!) If so, what would work better? Plain water? Salt water? I'm pretty sure vinegar, even highly dilute vinegar, is not the answer, because I've seen what happens if you accidentally leave an egg in the dye overnight. (My dyes contain about 1 tablespoon vinegar to 1 cup of water.)  

Has anyone tried this? Did it work? Am I crazy? (Wait, don't answer that last one.)
A bit messy, but tested successfully:

Blow out the eggs before dyeing them.

This means you can fill the floating eggs with the liquid dye and they’ll sink. Of course you need to make sure that the dye flows out of the shells again when taking them out.

Speaking from experience, this will work best with eggs that have two holes.

Alternatively you could drill a small hole at the wider end use a syringe with a needle and fill the enlarged air pockets (the reason for the floating observed in old eggs) with a suitable liquid like water.