Color Palette for Gantt Chart with 6 Sections:

1. Color Name: Teal
   Hex Code: 
                            
                            #008080
                        
   Description: A deep greenish-blue color representing the start of a project in the Gantt chart.

2. Color Name: Sky Blue
   Hex Code: 
                            
                            #87CEEB
                        
   Description: A light blue color symbolizing planning and preparation phase in the Gantt chart.

3. Color Name: Gold
   Hex Code: 
                            
                            #FFD700
                        
   Description: A bright golden color indicating progress and development in the Gantt chart.

4. Color Name: Coral
   Hex Code: 
                            
                            #FF7F50
                        
   Description: A vibrant coral color denoting deadlines and critical paths in the Gantt chart.

5. Color Name: Lavender
   Hex Code: 
                            
                            #E6E6FA
                        
   Description: A soft lavender color representing milestones and achievements in the Gantt chart.

6. Color Name: Slate Gray
   Hex Code: 
                            
                            #708090
                        
   Description: A neutral slate gray color signifying completion and end of a task in the Gantt chart.