If you take 10 different types of Arabica beans from different countries and roast each of the to a very similar level of roast (in terms of the development of flavours and in terms of the changes in physical structure), you will find that each type of bean will have a slightly different colour on the outside. If you then grind them, they will then probably all have very similar colours. But the surface colour will have more variation. Also if you break the bean you can see what is the colour of the main flesh of the bean, but you cannot study the interior bean colour while roasting. Although the majority of beans will have a broadly similar colour on the outside (at the same roast level), a few bean types will be much lighter and a somewhat larger number of bean types will be significantly darker (or at least, they will start to be dark on the outside much earlier, even though inside they are still relatively pale and the bean structure is still relatively hard - if you judge only from the colour you will stop the roast too soon and when you grind it you will find it is much paler than you thought).
When the beans are pale on the outside this is not a paleness like a filter roast, but the beans have a certain iridescent pale brown combined with hints of a dark chocolate brown, and could even be combined with the glistening oiliness of a high roast level.


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