It is an awful practice to describe the colors of precipitates with object-colors, like apple green, strawberry red, olive green, etc. I have seen these weird descriptions of hydrogen lines in its spectrum in first-year lab reports. You will not encounter this language in professional work. Avoid such usage while writing lab reports.
You can undoubtedly use simpler expressions without using an object like an apple or a strawberry, e.g., deep blue, bright yellow type expressions. There is no hard and fast rule as stated in the comments.
If you were to discover a new precipitate whose color is hard to describe, then a picture is worth a thousand words for a formal report (assuming the camera won't distort the colors).
Those who work in the textile industry and deal with fancy dyes use more sophisticated instruments to "describe" color. Color measurement science is a whole field of science, and there you do not need the crutches of such words. See, for example, this essay on Wikipedia Colorimetry