Raw materials are crude mixtures of the desired (or sought after) product along with some unwanted components. When analyzed through an analytical technique like thin layer or paper chromatography, raw materials develop spots corresponding to the compound sought after, alongside some additional spots. Thus by doing a simple TLC experiment, the one giving a single spot (in a suitable mobile phase) should considered a certain kind of product while the one giving a number of spots in the TLC plate should be considered as the raw material.
A raw material is the basic material from which a product is made.
Considering chemical reactions, the reactants are the raw material.
In order to distinguish the raw material from the mixture of product and unreacted raw material, the properties of the raw material such as its light sensitivity , temperature sensitivity and so on helps us.
For eg, if the mixture is exposed to certain wavelength of light and if the absorbtivity is similar to that of raw material, then we can sense the presence of unreacted raw materials.
A raw material is something directly taken from nature, like rubber or tin. The product would be a manufactured item (e.g. in factories) using the rm, like tyres or tin food cans. Normally raw materials are cheaper and not ready to be used directly.