Final answer:
To achieve a warm coppery red hue, one should begin with an orange or red-orange base and gradually add red to it until the desired shade is reached.
Step-by-step explanation:
To create a warm coppery red color, one should typically start with an orange or red-orange base color. Color mixing in art can be somewhat subjective and may require a bit of experimentation, but orange provides a warm undertone that, when mixed with red pigments, can yield a rich, coppery hue.
Add small amounts of red to the orange base until the desired coppery shade is achieved. It's important to add color incrementally to ensure that the resulting mix doesn't become overwhelmingly red or too dark.