what does head retention mean?

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cheschire

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malto dextrin adds head retention. Does that mean it retains it from appearing, or it retains it from disappearing? Also, is it considered a partial mash if your only using roasted barley(like caramel40L or chocolate) rather than malted aswell as extract?
 
Head retention, means to retain head, as in keep it.

40L and the like ARE malted barley.

I think anything that uses STEEPED grains for color and flavor only, no sugar conversion is just extract with specialty grains.

IF YOU MASH the grains in the alpha or beta range, Id consider that a partial mash, as you are getting some sugars from the malt.
 
Also, is it considered a partial mash if your only using roasted barley(like caramel40L or chocolate) rather than malted aswell as extract?

No, a mash of any sort requires malted barley that has not been roasted or toasted (AKA 2-row, base grain, etc), as these processes destroy the chemicals required to convert starch to sugar.
 
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