First, I need to write an original article for the keyword "What Colour Is Apple." The context provided is empty, so I'll rely on my own knowledge. The requirements are: 600 to 900 words, natural headings, avoid unsupported claims, and don't mention AI generation. I must return only safe HTML using h2, h3, p, ul, ol, li, strong, and em tags. The keyword is "What Colour Is Apple." This is likely about the color of apples in general, but it could also refer to Apple Inc. or something else. However, given the phrasing "What Colour Is Apple," it's probably about the fruit. But I should consider both interpretations: the color of the fruit apple and the brand Apple's logo color. But to be safe, I'll focus on the fruit since it's more common, but I can also touch on the brand. Structure the article: - Introduction: Explain the common question about apple colors. - Body: Discuss different apple varieties and their colors, factors affecting color, and maybe cultural perceptions. - Conclusion: Summarize. Use natural headings: e.g., "The Many Colours of Apples," "Factors That Influence Apple Colour," etc. Avoid unsupported claims: Use facts about apple varieties like Red Delicious, Granny Smith, etc. Word count: 600-900 words. I'll aim for around 750 words. HTML formatting: Use h2 for main headings, h3 for subheadings, p for paragraphs, ul and ol for lists, li for list items, strong for emphasis, em for italics. Now, outline: 1. Introduction (h2): "The Question of Apple Colour" - Explain that apples come in various colors, not just red. 2. Common Apple Colours (h2): "Exploring the Spectrum of Apple Colours" - h3: "Red Apples" – discuss varieties like Red Delicious, Fuji. - h3: "Green Apples" – Granny Smith, etc. - h3: "Yellow Apples" – Golden Delicious. - h3: "Other Colours" – bi-colored, pink, etc. 3. Factors Influencing Colour (h2): "What Determines Apple Colour?" - h3: "Genetics and Variety" – different strains. - h3: "Environmental Factors" – sunlight, temperature. - h3: "Ripening Process" – chlorophyll degradation, anthocyanin. 4. Cultural and Practical Considerations (h2): "Colour and Apple Selection" - How color affects taste perception, use in cooking. 5. Conclusion (h2): "The Colourful Truth About Apples" - Recap the diversity. Ensure no unsupported claims: Stick to known facts. For example, say "Many red apples get their color from anthocyanins" which is true. Write in engaging, natural language. Now, write the article. First, I'll write the HTML structure without markdown fences. Just directly output HTML. Start with or just the tags? The instruction says "Return only safe HTML using h2, h3, p, ul, ol, li, strong, and em tags." So I can use

,

, etc., but ensure it's safe and valid HTML. I'll begin with

for the main title? Or should I have a title tag? The instruction says "natural headings," so I can use h2 for section titles. Let me draft.

Introduction: The Question of Apple Colour

When someone asks "What colour is apple?" the immediate answer might seem obvious: red. However, apples are far more diverse in colour than many people realise. This simple question opens up a fascinating exploration of horticulture, biochemistry, and even cultural preferences. Apples come in a spectrum of hues, from deep crimson to bright green and sunny yellow, and each colour tells a story about the variety, growing conditions, and intended use of the fruit.

... Continue. I need to write 600-900 words. I'll expand with details. List apple varieties and their colours. Use a list for varieties? For example:

Red Apples