Preheat the oven to 175 degrees F. Line a half baking sheet with a silicon baking mat or parchment paper. If using parchment, leave 2 inches of excess paper on the sides to use as handles.
Pour the plain applesauce against the short side of the pan. Use an offset spatula to spread the applesauce into an even, thin layer; it should cover a quarter of the surface area.
Repeat this process with the mango applesauce, strawberry applesauce and berry applesauce to fill the remaining spaces, creating an ombre pattern. Be sure all the colors are in an even layer no more than 1/4-inch thick. Carefully place the baking sheet into the oven without tilting the applesauce. (If using parchment, make sure the excess paper is tucked under the baking sheet in the oven, so the oven fan doesn't blow the paper onto the fruit leather before it is dry.)
Bake until firm to the touch, about 5 hours and 30 minutes.
Remove from the oven and set aside to cool for 15 minutes. Use scissors to cut the cooled fruit leather into eight 1-inch pieces. Remove the parchment paper (if using) and wrap the strips in wax paper. Store in an airtight container for up to 1 week.
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