Rare Earths

Samarium nitrate, ca. 1900

Erbium nitrate, ca. 1900

Lanthanum oxide mixed with praseodymium oxide, ca. 1900
Neodymium nitrate, ca. 1900

Yttrium oxide, 1925

Europium nitrate, ca. 1900

Praseodymium-neodymium nitrate, ca. 1900

Cerdium oxide, ca. 1900

Donor: Wilhelm Prandtl, Ludwig-Maximilians-Universität, München.