Contrast dyes, or contrast media, are substances used in medical imaging to enhance the visibility of internal bodily structures. These dyes are typically iodine-based for X-rays and CT scans or gadolinium-based for MRI scans. They work by altering the way imaging scans display the body's organs and tissues, improving the contrast between different structures. This makes it easier to detect abnormalities such as tumors, blood vessel diseases, and certain conditions in the brain and heart. While generally safe, they can sometimes cause allergic reactions or adverse effects, particularly in individuals with kidney problems, which necessitates careful screening prior to their use.

The total number of Ink Ribbons in Resident Evil 2 can vary depending on the difficulty mode you are playing on. In the original 1998 version, players might find around 30 Ink Ribbons scattered throughout the game, allowing for 30 save opportunities. This number is not fixed as it depends on the player's exploration skills and chosen difficulty level; harder modes offer fewer Ribbons. The 2019 remake does away with Ink Ribbons for saving in its standard modes, reserving their use for the Hardcore difficulty setting, wherein the number is limited to enhance the challenge. Players must manage their saves strategically, making every Ribbon crucial to survival and progression. Finding and using Ink Ribbons thus adds an extra layer of tension and resource management to the game that has been praised for increasing its horror atmosphere.

Organic apples can have a natural wax coating produced by the fruit itself to protect it against moisture loss and enhance its appearance. However, when it comes to additional coatings, the USDA National Organic Program allows the use of certain natural substances like carnauba wax or shellac derived from the lac bug. These substances must be certified organic and comply with the organic handling standards. It's important to note that these coatings, if present, are significantly lesser in quantity and are derived from natural sources compared to conventional apples, which may use synthetic waxes. Regardless, all apples, including organic ones, should be washed before consumption to remove any residues on the surface.