Hi Cathy, unfortunately, Kit won't be alerted to your question, so she isn't likely to respond. However, we do include this tip from our bakers in our Meringues recipe: 

To make naturally-colored, fruit-flavored meringues: Combine 1 cup + 1 tablespoon (128g) of recipe's confectioners' sugar and 1/2 cup (15g) lightly crushed freeze-dried peaches in the bowl of a food processor. Process until powdered, then whisk the mixture through a strainer to remove any lumps. Stir a tablespoon of water into the mixture, then fold half the whipped meringue into it. Place both meringues into a pastry bag fitted with a star tip, alternating the colors as you fill the bag. Pipe and bake as the recipe directs.

I suspect you could substitute raspberry powder for the peach powder without any issues. 

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