From pg 48 of the Draught Beer Quality Manual
Testing for “Beer-Clean” Glass
Beer poured to a beer-clean glass forms a proper head
and creates residual lacing as the beer is consumed.
After cleaning, you can test your glasses for beer-clean
status using three different techniques: sheeting, the
salt test, and lacing. Let’s review each technique.
1. Sheeting Test: Dip the glass in water. If the glass is
clean, water evenly coats the glass when lifted out of
the water. If the glass still has an invisible film, water
will break up into droplets on the inside surface.
2. Salt Test: Salt sprinkled on the interior of a wet
glass will adhere evenly to the clean surface,
but will not adhere to the parts that still contain
a greasy film. Poorly cleaned glasses show an
uneven distribution of salt.
3. Lacing Test: Fill the glass with beer. If the glass is
clean, foam will adhere to the inside of the glass in
parallel rings after each sip, forming a lacing pattern.
If not properly cleaned, foam will adhere in a
random pattern, or may not adhere at all.
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