The dark tea products manufactured in recent years particularly the products refined from high-grade raw materials, also has a very high collection value.
Museums that house Renaissance oil paintings typically store them in environments that are carefully kept within narrow margins of temperature and humidity to inhibit any deterioration.
They will now be re-housed and put on display at the al-Jazeera museum, famous for containing thousands of paintings that were part of the royal collection.
"There's no artist on earth other than Jasper Joffe who would have painted Himmler this way, using these brush strokes and candy colours," the collector remarked at the time.
The demand for African art has grown over the past five years, and it is expected to expand yet further with the reopening of the Museum for African art in Manhattan next year.