Sudan iii dye solution has a high affinity for

The given blank can be filled with fats or lipids.

Explanation:

The solution of Sudan III dye changes to deep red or orange in color in the existence of lipids. It is insoluble in water and the particles of Sudan dye gets absorbed by the lipids, which leads to changes in color. The dye has an application in finding the unknown macromolecule from the solution.  

The use of this dye is done in health tests like confirmation of excess fat in stool samples. The affinity of the dye with the lipids or fats is high.  

i would have a lunch. it's one big package of food, making it one food. : p