what is a four letter ingredient in Ice cream that is not milk , salt ,...

Yolk? There are eggs in ice cream and I noticed your other guess have an "L" as the third letter.
 
"Agar"

Agar is a thickening agent often used in ice cream
http://en.wikipedia.org/wiki/Agar

"Agar can be...... a vegetarian gelatin substitute, a thickener for soups, in jellies, ice cream and other desserts, ......."
 
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