If you can't read it from that distance, then your audience will not be able to read it either when it is projected. Color adds attractiveness, interest, and clarity to slide and viewgraph illustrations and should be used whenever possible. If you use color, remember that contrasting colors are easier to see. If there are any more columns or rows, the information will not be readable. Whenever possible, present data using bar charts or graphs instead of tables.
Colored graphs are very effective.
Do not show data points unless scatter is important. Use paper or plastic mounted slides, designated for a 35 millimeter slide projector. Be sure that the slides and viewgraphs are clean and in good physical condition. Mark a large positioning dot or make a notch in the lower left hand corner of each slide when it is laid flat so it may be read. A notch or dot makes it easy to see that all slides are correctly positioned in the slide tray.