Chiaroscuro is Italian for<em> light and shadow</em>
Painters use this technique when they need to <u>create the illusion of light</u> on objects and people
I've attached a pic for example :D
Answer: Cross-contamination
Explanation: it is the transfer of harmful organisms from one surface to another that is often the cause. This is especially troublesome for raw, ready-to-eat foods, such as salads or other produce.