should i say: red in color

OR
reddish in color

Your question isn't clear.

which sounds better

which phrase sounds better? "Copper is...

...red in color"

OR

...reddish in color"

I would go with reddish in color although that may not be good English. Ms Sue or Writeacher may want to comment on that. It has a red tint but it is not exactly red.

The choice between saying "red in color" or "reddish in color" depends on the exact shade you are trying to describe. Here's how you can decide:

1. Determine the shade: "Red" typically refers to a pure, vibrant shade of red, while "reddish" suggests that the color has a hint or tinge of red but might also contain other colors.

2. Consider specificity: If you want to be more precise and emphasize a specific shade of red, such as scarlet or crimson, it is better to say "red in color." This implies a more definite and distinct hue.

3. Assess the degree of redness: If you want to convey a color that is mostly red, but not entirely, such as slightly orange-red or pinkish-red, then "reddish in color" could be more appropriate. This allows room for a slight variation or mix of colors.

Ultimately, the choice depends on your intention and the specific color you are describing.