it's a solution that is an indicator to test for lipids.
Like lipids, the chemical Sudan IV is not soluble in water; it is, however, soluble in lipids. Therefore to test for the presence of lipids in a solution you will use a Sudan IV Test. In this test dark red Sudan IV is added to a solution along with ethanol to dissolve any possible lipids. If lipids are present the Sudan IV will stain them reddish-orange, giving a positive test.
The chemical Sudan IV is not soluble in water; it is, however, soluble in lipids. Therefore to test for the presence of lipids in a solution you will use a Sudan IV Test. In this test dark red Sudan IV is added to a solution along with ethanol to dissolve any possible lipids. If lipids are present the Sudan IV will stain them reddish-orange, giving a positive test.
dissolve in 95% ethyl alcohol and heat it
Sudan III is used to detect the presence of lipids.
The Sudan IV dissolves into the oil making the oil red.
Egg yolk should have a reaction in the Sudan IV test, because the Sudan IV tests for lipids (fats), and the yolk does have some fat in it. The Sudan IV test should have not had a reaction for egg membrane or egg white. Hope that helped!
Usually water is the best control substance for the Sudan IV test.
Sudan IV is a chemical that is only soluble in lipids. This indicates that a positive Sudan IV test means that the food is a significant source of lipids.
Sudan IV is a diazo dye for staining lipids, lipoproteins, and triglycerides. It is used in Sudan staining, wherein it attaches to the fats chemically.
No
It changes from dark red when added to a solution to a lighter reddish-orange colour if testing positive for lipids.
for me, i think the uncoated paper test is more sensitive than Sudan iv test. This is because Sudan iv test can only soluble in certain solvent thus make it harder to define either the solution that is tested is really have lipid in it although there is not. The uncoated paper test can show if there is lipid the the solution if greasy transparent spot comes out from the uncoated paper.