Glow ink fireworks for revealing cave ceilings

Glow ink fireworks are only crafted using 1-3 gunpowder, 1 paper and 1 glow ink sac. Once it blows up, it lights up all surrounding blocks in its range. This effect disappears after some time or when the affected blocks are mined out. It lights up the blocks the same way that the glow squid glows; It's visible in the dark but it doesn't emit light. Lastly, to make my suggestion tie into cave exploration, make glow squids abundantly spawn in aquifers :)