I still don't know the answer but I can guess. First off I am not buying the story of a special micro grind. As I said in the other post chemistry was not my best subject but I don't recall any thing about grinding an insoluble substance fine enough to make it soluble. I think it is soluble coffee made with either the spray dry or freeze dry process. I think the difference is that they start with decent coffee rather than the cheap robusta in the store brand instant. Also they probably extract less coffee from the grounds than the folks who are making the real nasty stuff.
The result is still not good coffee, it is still just marginally drinkable.
You CAN grind an insoluble substance fine enough that it stays in suspension. If an insoluble substance is ground that fine and put in something, it's in a colloidal suspension. I'm not saying that is what starbucks is doing, but it seems like a good guess. Powders can act weird when they get that tiny though, so it probably is more complex than putting coffee beans through a matcha mill. Maybe not. It would be fun to play with, if one had enough money that gumming up a $100 matcha grinder wasn't a big deal.
Posted Mon Mar 25, 2013, 6:56pm Subject: Re: What's really inside those instant starbucks coffee packs.
The resulting "explosion" is not an issue of what chemicals might be involved, it's a matter of heat exchange. When you add the hot water, cap the cup and shake, you are in essence heating the remaining air in the cup. When air is heated, it expands, creating a higher pressure inside the cup. When you removed the lid, that higher pressure equalized resulting in the coffee explosion.
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