Engraving of German chemist Martin Klaproth 1743 – 1817, the discoverer of titanium, by Ambroise Tardieu after an original portrait by Eberhard-Siegfried Henne.

Engraving of German chemist Martin Klaproth 1743 – 1817, the discoverer of titanium, by Ambroise Tardieu after an original portrait by Eberhard-Siegfried Henne.

Engraving of German chemist Martin Klaproth 1743 – 1817, the discoverer of titanium, by Ambroise Tardieu after an original portrait by Eberhard-Siegfried Henne.