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The materials required for the science fair project:
- 20 participants –  boys and girls of various ages
- 80 plastic cups
- 3 types of food coloring – red, orange, purple
- 4 jugs
- 1 kg sugar
- 4 bottles of lime juice
- 4 bottles of soda water
- 1 refrigerator
- 20 forms to fill
- 1 black marker pen


1. For this science fair project, the independent variable is the coloring of the beverage. The dependent variable is the choice made by the participants in selecting the flavor of the beverage. This is determined by gathering the data from the forms distributed to the participants. The constants (control variables) are the size of the plastic cups, the mixing ratio of soda water and lime juice, the amount of sugar added and the amount of beverage served.

2. Equal amounts of soda water and lime juice and the same servings of sugar  are  added and mixed into all 4 jugs. A few drops of red food coloring is added to the first jug until a tempting red color is obtained. Orange food coloring is added to the secondjug and purple food coloring is added to the third jug is added with purple food coloring. The fourth jug will remain clear without any coloring. The jugs are kept in a refrigerator overnight.

3. A form is created for the participants to fill in their choice of flavor for each drink. An example is given in Table 1 below.

4. On the second day of the experiment, the 4 jugs of beverage are brought out of the refrigerator for testing. Each type of drink is poured into 20 paper cups. The 20 participants are  each  given 4 cups containing the different colored drinks and a form to fill in their choice.

Table 1

Flavor of beverage

Please tick the flavor of the beverage









5. After the participants have completed  the forms, the results are collected for analysis and the choices tallied and recorded in the table below.

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Complexity level:
Project cost ($):
Time required:
1 day to prepare, 1 hour for science fair project
Material availability:
Easily found
Safety concerns:

Basic safety requirements