By contrast, steeped or percolated coffee made with robusta beans is very strong in caffeine.
ECONOMIST: Espresso coffee
India's status as the world's fourth-largest exporter of robusta beans after Vietnam, Brazil and Indonesia could be changed by domestic demand.
WSJ: India's Taste for Coffee to Affect Bean Prices
Around 70% of production is the robusta type of beans, the more bitter and cheaper variety than arabica.
There is also a fantastic resource on the different types of beans available and how they are processed - discussing the difference between Arabica and Robusta coffees and a very interesting explanation of how monsooned beans are made.
BBC: NEWS | Programmes | Click | Webscape
True espresso must be made entirely from arabica beans, which have half the caffeine of the alternative robusta variety.
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