In 1980, Dammann Frères created the crystal herbal teas bag (sachet Cristal) : the light, fine and highly transparent material allow us an unhindered view of the carefully selected  herbal teas leaves and their captivating unfurling during infusion. The Cristal tea bag offers, for each cup, an optimal infusion with respect to the character of each selected herbal teas. Sachet Cristal is registered trademark.