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The Elf eyelid primer can be compared to the well known Urban Decay Primer Potion. There is a huge price difference between the two items. The Elf one is only $1 while the primer potion ranges from $18. You can see the results for the elf one. On the left side was with the primer as a base, on the right the shadow was just applied directly. With the primer, the shadow was much more bold and pigmented. Best dollar ever spent.
*Photos were taken by me