This topic is about a person who noticed a dark-green stain on the outer edge of their ostomy wafer after three days of wear. They were puzzled because the barrier ring area under the wafer was clean, and they were curious about the dark green color of the output. Here are some insights and advice shared by others:

1. **Leak Location and Possible Causes**
- The stain pattern suggests a possible issue with the pouch or wafer, such as a micro-defect or a poor seal between the pouch and flange, rather than a problem with the barrier ring.
- Ensure the pouch is fully clicked into the wafer by pressing the edges of the coupling to confirm a complete seal.

2. **Understanding Output Color**
- Dark green output is common and usually indicates bile, especially if little food has been consumed or overnight.
- It can also result from eating green foods like spinach or consuming products with artificial dyes, including red or purple drinks.

3. **Wear Time and Leakage Patterns**
- A wear time of 3 to 5 days is considered good. True leaks typically start at the inner opening and move outward.
- Occasional edge staining without inner-ring discoloration suggests a pouch or flange failure rather than an application error.

4. **Product Issues and Replacements**
- There have been reports of faults with Hollister pouches and wafers. Some users have mentioned issues with Hollister Adapt 7805 rings and CeraRing 8805, while others have not experienced problems.
- If you suspect a whole box is faulty, consider contacting the manufacturer, such as ConvaTec, as they often replace defective products.

5. **Application Tips**
- Use a barrier ring (the "sticky ring" you already apply) and press it firmly to the wafer before attaching the pouch.
- A support or flange belt with a 2-piece system can enhance security.
- Proper skin preparation is crucial; leaks that saturate the ring may indicate a slow seep due to poor fit or watery output.

6. **Managing Watery Output and Skin Protection**
- Change the appliance more often if the output is very liquid to protect the skin. However, frequent changes (several per day) suggest a problem that needs addressing.
- Foods like marshmallows can help thicken the output if it is too watery.

7. **Stoma Considerations**
- Flat or very small stomas may create higher pressure, making sealing more challenging. Choosing the right appliance or using convex products might help, although this was not directly discussed but implied in troubleshooting.