Dreams DO come true!

How quick was that?! 100 g of citric acid, 200 g of baking soda, some colourant, some fragrance, and a spray bottle full of denatured alcohol, and here we are, 5.5 - 1.75" diameter bath bombs later!

Cue the Staples button: "That was easy!"

The fragrance is New Directions Aromatics black tea, which is quite lemony. The colours didn't quite work out as I had planned; I'd hoped for brown and yellow, but I used liquid dyes so they kind of balled up in the powder. Maybe I really do need to buy more ingredients....