ILNP Sirene (H) is a cool duochrome with a metallic finish that is permanent and retails for $12.50. In comparison, ILNP Birefringence (H) is a cool duochrome with a metallic finish that is permanent and retails for $12.50.
ILNP Birefringence (H) is 80% similar — it is brighter, cooler.
