Not the ice your looking for but, I like making my ice colors look like ice so I only use highlights and .008 flakes in silver or hologram. I’ve found with each diff plastic I need diff amounts of tints. No problem adding them while it’s hot so I start off with a ¼ tsp per cup and add more if needed. Mixing tints makes some killer colors.
White pearl belly, ice middle, with a thin dark back. Forgetaboutit. Like crack to fish.