coloring matter

The normal butter coloring matter will not dissolve when thus treated.

In artificial extracts some such coloring matter as caramel or tannin is used.

Organic coloring matter may be detected by the same method used for detecting such colors in coffee.

The coloring matter of these appears to be carbonate of copper.

Before using the oleomargarine, this coloring matter is simply worked into the fat until it is evenly colored.