Tricolor beech (Fagus sylvatica 'Purpurea Tricolor') requires part shade, especially protection from hot afternoon sun. In full sun (especially in Chicago summers), the delicate pink spring foliage scorches, turns brown, and crumbles—exactly your described cycle.
Holly-tone (acidifying) is fine but not a fix for sun scorch. Two applications per year (spring/fall) are sufficient once established.
The tree isn't "dying"—it's in the wrong spot. Move it to afternoon shade, and the pink foliage will hold all season.
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