Bark that turns the water blue
Palo azul is bark and wood chips, wildcrafted in Mexico. The bag prints Cyclolepis genistoides, while Mexican markets usually mean Eysenhardtia polystachya by the same name, so go by the bag if the species matters to you. Its method is a short steep: a tablespoon in a strainer in a mug or teapot, hot water poured over, covered three to five minutes.
The product description gives a longer way, three to five pieces boiled in water, and says the water takes on a blue tint as it stands, more so with alkaline water. The bag counts 50 to 60 cups in 4 oz and 100 to 120 in 8 oz, and no other item in our catalog comes in as many sizes: a pound, 2 lb and 5 lb follow. Pour the tea into a clear glass jug and you will see the tint against the light of a window.
In the YERBERO collection, Palo azul is filed under P in the herbolario A–Z, next to Palo azul en polvo.