I checked what an artificial intelligence search turned up and it pointed out that uneven shading in the dried material does not automatically mean the batch is spoiled. The split from deeper color on top to paler shade underneath often just shows the compound did not spread evenly through the solid mass. This can happen from small differences in how the freeze-drying step went, fillers drifting apart while the vial was filled, or slight movement during transit. The product should still work fine if the overall tint stays in the blue family and avoids turning gray, green, or white. A quick way to confirm is to add the sterile liquid and watch whether everything turns into a smooth blue mixture without clumps or residue left behind. The same pattern across every container, even ones that never left the facility yet, makes me less concerned about it.