Final answer:
The supplied reference material discusses engine firings and flame colors, not parachute streamer colors. Without explicit standards or context, the color streamer for a parachute with a .25 second delay cannot be determined.
Step-by-step explanation:
The question appears to relate to the color coding of streamers for automatic parachutes, which could be used in a context such as model rocketry or military applications where the timing of parachute deployment is critical. Based on the reference given, which discusses the timing of different engine firings and their associated flame colors, it does not provide a direct answer to the streamer color for a parachute with a .25 second time delay. The reference speaks about different engine firings and mentions a 3 s (green flame) and a 4 s (yellow flame), which correspond to the different types of fuel mixtures used in engines.
However, this information does not correlate with the color of a parachute streamer. Therefore, without additional context or a standard from a specific organization, it is not possible to provide an accurate answer. The events mentioned, such as Let B = the event of landing on blue, or similarly for red, green, and yellow, do not lead to a definitive conclusion on the color of a streamer attached to a parachute with a specific time delay.