The operations must have had quite an impact, since Queen Christina (1626-1689) when handing the area over to the city in 1647, explains she wished to see storehouses built on "Bäck- eller Tiärholmen" (The "Pitch" or "Tar Islet") for "the advantage and benefit of the city and the residents". Thus having both its name and reputation set, the islet was bestowed a tar distilling workshop, originally intended for the north-eastern shores of Södermalm, replacing the boilery during the 1680s. Private entrepreneurs took charge of the island in 1717 and, in spite of a devastating fire in 1723, developed it into an important part of their trading house.