Yellow is often associated with cowardice or fear because it can represent weakness or caution.
Some lanterns weaknesses are the color yellow, but well trained lanterns can overcome this weakness.
The flag is red for coach's challenges, yellow to indicate penalties called by the official
Green Lantern has a weakness to the color yellow and his power ring is entirely dependent on his willpower. If an opponent were to take away his willpower or use the color yellow then yes, Green Lantern could be defeated.
Universal litmus paper typically changes color from red to blue to indicate the acidity or basicity of a substance.
No, the prefix "chlor-" in the word chlorine does not indicate a greenish color. It comes from the Greek word "khloros," meaning greenish yellow, but the color of chlorine gas itself is actually a greenish-yellow.
No, amber is not a normal urine color. Normal urine color can range from pale yellow to dark yellow, but amber color may indicate dehydration or other health issues. It is advisable to drink more fluids and consult a healthcare professional if the amber color persists.
A yellow color indicates a positive mannitol test. This means that the organism can ferment mannitol, producing acid which causes the phenol red indicator to turn yellow.
Blue
You are correct
Gray
Pipes carrying natural gas are typically color-coded with a yellow exterior to indicate that they contain gas. This yellow color helps workers and emergency responders easily identify gas lines and take appropriate safety precautions.