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entity go
that which is perceived or known or inferred to have its own distinct existence (living or nonliving)

physical entity go
an entity that has physical existence

matter go
that which has mass and occupies space

substance go
the real physical matter of which a person or thing consists

material, stuff go
the tangible substance that goes into the makeup of a physical object

color, colour, coloring material, colouring material go
any material used for its color

indicator go
(chemistry) a substance that changes color to indicate the presence of some ion or substance

acid-base indicator go
an indicator that changes color on going from acidic to basic solutions

congo red
a red-brown azo dye especially as a chemical pH indicator (congo red is red in basic and blue in acidic solutions)

noun.substance

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