Thanks to Drew for the inspiration, first. :O)
So I took my clear/white 32oz lamp (which was just a transfer from a rainbow globe) fired it up, uncapped it and added 6 drops of yellow food coloring. This is the result. I love it! :O)
I had two different food coloring brands and luckily I tested them on water first:
I have "McCormick" coloring, which turned the water more of an orange/yellow... not what I wanted.
Then I had "Durkee" coloring which was perfect. Very yellow and beautiful. I'm now thinking of adding red coloring to a yellow/clear and trying some other food coloring experiments.
Anyway here's a couple previews and then the rest of the pics are on my page if you're interested.
Oh yeah... and look how ridiculously clear that liquid is. I don't know if all the rainbow globes contain such clear liquid, or maybe I just got lucky. I'll have to get another one for future experiments and hope it's equally clear.