Gray flour is the local language of Sichuan, it is equivalent to flour. The difference between flour and starch:

1, different nature

Flour is wheat or other grains peeled directly into the powder; starch is from the separation of proteins and other substances in the flour after a polysaccharide substance, insoluble in water, in hot water will absorb water and become viscous translucent colloidal solution.

Flour

Starch

2, ingredients

Flour is rich in protein, fat, carbohydrates and dietary fiber, sweet and cool taste, have the heart and kidneys, spleen and thick intestines, in addition to the effects of heat and thirst; starch is a part of the flour, the main ingredient is more than 80% of carbohydrates and more than ten percent of the water.

3, the application of different

Starch in addition to food, industry, used in the production of dextrin, maltose, glucose, alcohol, etc., but also used to modulate the printing pulp, textile sizing, paper gluing, drug tablets, such as pressing.

Flour (wheat flour) is the staple food in most of northern China, and the food made from flour is varied, fancy and very different in flavor

Baidu Encyclopedia - Flour

Baidu Encyclopedia - Starch