Creating a simple React CAPTCHA (Completely Automated Public Turing test to tell Computers and Humans Apart) involves generating a challenge that is easy for humans to solve but difficult for bots. In this example, we'll build a basic React CAPTCHA component that asks the user to identify a specific color. Let's get started!

First, make sure you have Node.js and npm (Node Package Manager) installed on your machine. Then, create a new React project using Create React App or any other preferred method.

1. Set up the project:

Assuming you have a new React project ready, navigate to the project directory and create a new component called `Captcha.js`.

2. Install dependencies:

You'll need a color library to generate random colors. We'll use `randomcolor`, so install it using npm:

```bash

npm install randomcolor

```

3. Implement the Captcha component:

Inside `Captcha.js`, import React and the required dependencies:

```jsx

import React, { useState, useEffect } from 'react';

import randomColor from 'randomcolor';

const Captcha = () => {

const [captchaColor, setCaptchaColor] = useState('');

const [userInput, setUserInput] = useState('');

const [isCaptchaValid, setIsCaptchaValid] = useState(false);

// Function to generate a random color and set it as the captcha

const generateCaptcha = () => {

const color = randomColor();

setCaptchaColor(color);

};

// Check if the user's input matches the captcha color

const checkCaptcha = () => {

setIsCaptchaValid(userInput.toLowerCase() === captchaColor.toLowerCase());

};

// Hook to generate a new captcha on component mount

useEffect(() => {

generateCaptcha();

}, []);

// Handle the input change

const handleInputChange = (event) => {

setUserInput(event.target.value);

};

return (

);

};

export default Captcha;

```

4. Usage:

Now that you have the Captcha component, you can use it in your main `App.js` or any other parent component:

```jsx

import React from 'react';

import Captcha from './Captcha';

const App = () => {

return (

);

};

export default App;

```

That's it! Now, when you run your React application, it will display a random colored box and ask the user to identify the color. When the user enters the color name (case-insensitive) and clicks "Submit," the component will validate the input and display a success message if the CAPTCHA is solved correctly.

Keep in mind that this is a simple example to demonstrate the concept. In a real-world scenario, you may want to add more complexity to your CAPTCHA to make it more secure against automated attacks.