Khatai

As many of the illustrations show, color adds impact to presentation aids. Clearly, most colored presentation aids can attract and hold attention better than black-and-white aids. Color also is a subtle way to convey or enhance meaning.
For example, a speech about crop damage from a drought might use an enlarged outline map showing the least affected areas in green, moderately damaged areas in orange, and severely affected areas in brown.
The natural colors would reinforce the message.
Color can also be used to create moods and impressions.
For example,
blue suggests power, authority, and stability (blue chip, blue ribbon, royal blue). Using blue in your graphics can invest them with these qualities.
Red signals excitement and may be used to indicate the presence of crisis (in the red, red ink).
Line graphs tracing the rise in cases of AIDS could be portrayed in red to convey a sense of urgency.You should avoid using red when presenting financial data unless you want to focus on debts or losses.