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| style="height:20px; width:400px; text-align:center;" |Iodine solution is an orange liquid. When the iodine solution is added to starch the iodine solution turns from orange to blue-black.
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===Testing For Protein===
: Adding [[protein]] to [[Biuret]] [[solution]] will cause the [[solution]] to turn purple.
=====Method=====
#Take a small sample of food and [[dissolve]] it in [[water]].
#Add some [[Biuret]] to the [[solution]].
#If it turns from blue to purple then the food contained [[protein]].
{| class="wikitable"
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|[[File:Biuret.png|center|300px]]
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| style="height:20px; width:300px; text-align:center;" |This [[Biuret]] has turned purple, indicating protein is present.
|}
===Testing For Lipids===
: Adding [[lipid]]s to paper can turn the paper [[translucent]].
=====The Paper Test Method=====
#Take a small sample of food.
#Wipe it on a piece of paper.
#Hold the paper up to the light.
#If the paper has turned [[translucent]] the food contained [[lipid]]s.
{| class="wikitable"
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|[[File:FatTest.png|center|600px]]
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| style="height:20px; width:600px; text-align:center;" |There are two patches where fat has been asborbed by the paper.
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=====The Alcohol Emulsion Test Method=====
#Take a small sample of food.
#Place the food in [[ethanol]] and mix by shaking or stirring.
#[[Filter]] the [[mixture]].
#Add the clear [[solution]] to some water.
#If lipids are present then a white [[emulsion]] will appear.
{| class="wikitable"
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|[[File:AlcoholEmulsionTest.png|center|600px]]
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| style="height:20px; width:600px; text-align:center;" |The mixture on the right shows the presence of [[lipid]]s.
|}