The fading of green glass in the microwave is unlikely, as microwaves generally do not have a significant effect on glassware. Microwaves work by emitting electromagnetic waves that excite water molecules in the food, causing them to vibrate and generate heat. This process is relatively safe for most glass containers, including green glass butter containers.
However, there are a few important points to consider when using glassware in the microwave:
Microwaving empty glass: Never microwave an empty glass container. When there is no food or liquid to absorb the microwave energy, the glass may heat up rapidly and could potentially crack or shatter due to thermal stress.
Microwave-safe label: Ensure that your green glass container is labeled as microwave-safe. Most glassware intended for microwave use will have this designation, indicating that it can withstand the heat and energy generated by the microwave.
Avoid drastic temperature changes: While microwaving glass is generally safe, avoid subjecting it to extreme temperature changes, such as placing it directly from the microwave onto a very cold surface. Gradual temperature changes are less likely to cause issues.
Check for damage: Before microwaving, inspect the glass container for any cracks, chips, or damage. Damaged glassware can be more susceptible to breakage during microwaving.
Overall, as long as your green glass butter container is labeled as microwave-safe and is in good condition, it should be safe to use in the microwave for softening butter. Just remember to always use caution when handling hot glass items, and consider using oven mitts or a towel to protect your hands.