Color Palette: React Development Blog

1. Primary Blue
   - Hex Code: 
                            
                            #2196F3
                        
   - Palette Description: This vibrant blue color represents the core identity of React, symbolizing innovation, technology, and professionalism. Use it for headings, links, or any important elements that need to grab attention.

2. Subtle Gray
   - Hex Code: 
                            
                            #E0E0E0
                        
   - Palette Description: This light gray shade provides a neutral and subtle background color. It can be used for the main content area, providing a clean and professional appearance, allowing the focus to be on the content itself.

3. Accent Green
   - Hex Code: 
                            
                            #4CAF50
                        
   - Palette Description: This refreshing green color serves as an accent to highlight important elements or call-to-action buttons. It brings a sense of growth, success, and positivity to the overall design.

4. Dark Text Gray
   - Hex Code: 
                            
                            #333333
                        
   - Palette Description: This dark gray shade is perfect for body text or any text-heavy sections. It ensures readability and adds a touch of sophistication to the overall design.

5. Error Red
   - Hex Code: 
                            
                            #FF5722
                        
   - Palette Description: This intense red color signifies errors or warnings in the React development blog. It can be used for error messages, alerts, or any critical information that needs to be conveyed to the readers.

6. Border Light Gray
   - Hex Code: 
                            
                            #CCCCCC
                        
   - Palette Description: This light gray shade can be used for borders, dividers, or visual separations between different sections of the blog. It adds a subtle distinction without overpowering the overall design.

This color palette for a React development blog combines a vibrant primary blue with subtle grays and an accent green to create a professional and visually appealing design. The dark text gray ensures readability, while the error red provides attention to critical information. The border light gray brings visual separation and organization to the different sections of the blog.