ILNP Birefringence (H) is a cool duochrome with a metallic finish that is permanent and retails for $12.50. In comparison, ILNP Hush (H) is a cool duochrome with a metallic finish that is permanent and retails for $12.50.
ILNP Hush (H) is 85% similar — it is darker, brighter, cooler.
