Eazy Colours green.
 
Emerald green is a more true Royal green then its Light Granny Smith Apple green companion. Both are very nice colors.
 
Batch certified, food safe EazyColours dyes. Only a speck is needed to provide vivid, bright colors in water.

Water Soluble dyes mean that no polysorbate 80 is needed for clean dispersal in water based products and tub water. No more scrubbing stained tubs or post bath showers like with other colorants. Your customers will thank you.

10g gives you about 23 batches of bath bombs if using 1/8 tsp with a 4 cup batch of bath bomb mix.