In which type of print can materials like blood or grease be found?

The correct answer is patent fingerprints, which are visible impressions made when a finger comes into contact with a surface that leaves a print that can be seen without additional processing. These types of prints can be formed when fingers coated with substances such as blood, grease, or ink touch a surface, making the substances distinctly visible as they leave a clear mark.

Patent fingerprints are particularly important in forensic investigations because they can provide immediate evidence of contact with a scene or object, allowing for direct comparisons to known prints. This visibility means they can often be documented and analyzed on the scene without the need for any enhancement techniques typically required for latent prints, which are not readily visible to the naked eye.

Understanding the nature of patent fingerprints helps in recognizing how various materials can contribute to forensic evidence, making this answer the most appropriate choice.