If you have a good chat and the interviewer is nice, he will return your resume to you, probably just thinking that you are still looking for the next one. After all, finding a job is a two-way choice. Don't waste another one. Especially color printed resumes.

If the interviewer is not interested in you, he will return your resume to you, indicating that you should continue to find the next one, and don't waste the printed resume. But I usually tell you directly in this case. If you don't want to hire you in your heart, but you don't say it on the surface, you will usually put away your resume.