Here is list of companies whose rum bottle labels I have in my collection:
"Think of high-ester rum as a concentrate," Main Rum Company’s Ben cross told me. He went on to explain that it was created at the Vale Royal Distillery in the early twentieth century by Jamaica's government chemist, Dr. H. Cousins, as a way of maintaining Jamaica's rum trade with Germany. The German government had slapped an ad valorem tax on rum in order to protect its domestic spirits industry. Dr. Cousins' solution was to produce an ultraconcentrated rum which, when added in small quantities to German-made neutral spirit, resulted in a rum-flavored drink known as Rumverschnitt.