Warm weather is wonderful, but it does bring questions. Every summer, our retail partners receive a small but steady stream of customer queries about chocolate that looks a little different: pale, streaky, dull, or slightly dusty in appearance.
If you’ve ever had a customer hold up a bar with a slightly concerned expression and ask ‘has this gone off?’ Then this guide is for you.
The short answer is: no. What they’re seeing is almost certainly chocolate bloom – a completely natural and harmless reaction that has nothing to do with quality, ingredients or shelf life. But knowing that, and being able to explain it confidently, makes all the difference in giving your customers reassurance and keeping them coming back.
We’ve put this guide together to help you understand bloom, explain it to customers, manage stock wisely during hot spells, and know when to get in touch with us. We hope you find it useful.
What is Chocolate Bloom
Chocolate bloom is a natural reaction that occurs when chocolate is exposed to changes in temperature or moisture. It appears as pale streaks, white patches, a grey surface or a dusty-looking coating on the chocolate.
Bloom is completely safe to eat. It does not indicate spoilage, poor quality or a problem with the product. It is simply chocolate reacting to its environment.
There are two types of bloom, and understanding the difference helps explain why it happens and how to prevent it.
Fat bloom
Fat bloom occurs when the cocoa butter within the chocolate warms slightly, begins to separate, and then re-crystallises unevenly as the temperature drops again. The result is a pale, streaky or dull surface, sometimes described as looking ‘waxy’ or ‘greasy’. Common causes in a retail environment include:
- Warm shop floors: particularly near windows, conservatory-style spaces or areas with poor ventilation
- Direct sunlight: even for short periods, sunlight can raise the surface temperature of chocolate significantly
- Fluctuating temperatures: chocolate moved repeatedly between warm and cool environments is especially vulnerable
- Humid environments: storage areas with high humidity or poor air circulation
- Rapid temperature changes: moving chocolate quickly between cold storage and warm display areas
- Transport and delivery conditions: prolonged journeys in warm vehicles can occasionally cause bloom before products even reach your shelves
Sugar bloom
Sugar bloom occurs when moisture or condensation comes into contact with the surface of the chocolate. The moisture dissolves a small amount of sugar, which then re-crystallises as the moisture evaporates, leaving a rough, dusty white coating. Common causes include:
- Refrigeration: one of the most frequent causes of sugar bloom; when cold chocolate meets warmer air, condensation forms on the surface
- Humid environments: storage areas with high humidity or poor air circulation
- Rapid temperature changes: moving chocolate quickly between cold storage and warm display areas
A quick way to tell the difference: fat bloom tends to look streaky or slightly oily, while sugar bloom usually looks rougher and more powdery to the touch. Both are harmless, although unsightly.
Practical storage tips for warm weather
With a few simple adjustments, the risk of bloom during warm spells can be significantly reduced.
Storage
- Keep chocolate away from direct sunlight at all times. Even brief exposure can raise the surface temperature
- Maintain the coolest stable temperature possible. Ideally between 12–18°C
- Avoid display areas near windows, heat sources or air conditioning units that cycle between warm and cool
- Store stock in its original packaging or in airtight containers where possible
- Avoid refrigeration unless absolutely necessary. If you must use a fridge, place chocolate in an airtight container and allow it to return gradually to room temperature before display or sale
Stock management
During particularly warm periods, smaller and more frequent replenishment can work better than holding large amounts of stock on the shop floor at once. A leaner display during extreme temperatures often helps reduce unnecessary bloom and customer disappointment.
It’s also worth rotating stock regularly, keeping the freshest deliveries at the back and moving older stock to the front, to ensure consistent product quality throughout warmer spells.
Display positioning
If your shop has a particularly warm area: near a south-facing window, a conservatory-style space, or close to cooking or heating equipment, consider relocating your chocolate display during summer months to a cooler part of the store. A small change in positioning can make a significant difference.
How Choc Affair supports you during warm weather
- We may delay dispatch during particularly hot spells to avoid products travelling in high temperatures
- We can support rapid turnaround should you find yourself running low during a warm spell and needing to reduce display stock
- We are always happy to advise on storage, display and customer communications. Please don’t hesitate to get in touch
If you receive a delivery and are concerned about the condition of any product on arrival, please contact us before putting stock out on display. We would always rather know and work with you to find a solution than have products reach your customers in a condition that disappoints.
Talking to your customers about bloom
Most customers, once they understand what bloom is and why it happens, are usually reassured.
One last point that is worth noting: bloom is actually more likely to occur in high-quality chocolate made with real cocoa butter. Cheaper chocolate products that use vegetable fat substitutes are often more resistant to bloom, which is a useful piece of context if a customer is comparing products.