Mastering Realistic Glass Refraction on Cosmetic Bottles with Nano Banana 2
Creating convincing images of clear containers is one of the most challenging tasks in AI image generation. When users attempt to generate cosmetic bottles using basic instructions, the results often appear flat, opaque, or like solid plastic rather than transparent glass. This issue stems from a lack of specific lighting and material definitions in the prompt. To overcome this, you must explicitly describe how light interacts with the surface, including refraction, reflection, and internal transmission.
Nano Banana 2 serves as the AI image generation tool designed to handle these complex visual requests through its text-to-image and image-to-image workflows. It is crucial to understand that Nano Banana refers strictly to the software interface and not a physical skincare brand or the bottle itself. The generated products are generic and unbranded by design. By utilizing the prompt library available within the platform, users can copy specific instruction sets to guide the model toward high-fidelity material realism. However, it is important to note that while prompt instructions describe desired outcomes, they do not guarantee the preservation of specific labels, typography, or exact object identities in every iteration.
Defining Light Physics and Transparency
The foundation of a realistic glass effect lies in describing the behavior of light. Instead of simply asking for a "glass bottle," your prompt must articulate the optical properties. You need to specify that the material allows light to pass through (transmission) while bending it (refraction). For cosmetic bottles, this means the background should be visible but distorted behind the container walls.
When constructing your request, include terms like "caustic light patterns," "internal refraction," and "clear borosilicate glass." These keywords signal the model to simulate the way light rays scatter when passing through curved surfaces. Without these details, the AI defaults to a standard opaque rendering. Remember that Nano Banana 2 supports distinct Google image models, such as Gemini 3.1 Flash Image for general tasks. While the tool offers example prompts, each user must adjust the phrasing to match their specific scene requirements. The goal is to move beyond simple descriptors and into the realm of physical simulation within the text input.
Five Distinct Prompt Strategies for Different Scenarios
To achieve varied results, you can adapt your approach based on the specific visual challenge. Below are five materially different usable prompts labeled as examples, along with guidance on when to apply them and necessary adjustments.
Example 1: The Minimalist Product Shot Prompt: "A pristine, unbranded cylindrical glass perfume bottle sitting on a white marble surface. The glass is perfectly transparent with high clarity. Show strong caustic light reflections on the table caused by the bottle's curvature. Soft studio lighting creates sharp specular highlights on the rim. No liquid inside, just empty clear glass." Use Case: Best for clean e-commerce listings where the focus is purely on the container shape and material quality without distractions. Adjustment: If the background appears too busy, add "minimalist background" or "soft gray backdrop" to isolate the refraction effects.
Example 2: The Liquid-Filled Container Prompt: "A clear glass cosmetic jar filled with a viscous, translucent blue serum. The liquid level is visible with a meniscus curve at the top. Focus on the refraction of the blue liquid distorting the view of the background through the glass walls. Include subtle bubbles trapped near the bottom. High-resolution macro photography style." Use Case: Ideal for showcasing product contents where the interaction between the liquid and the glass wall is the primary visual interest. Adjustment: If the liquid looks too solid, add "watery texture" or "fluid dynamics" to enhance the sense of viscosity and movement.
Example 3: The Curved Surface Challenge Prompt: "An oval-shaped, unbranded glass bottle with a highly curved body. Emphasize the distortion of the background grid lines seen through the side of the bottle. Render realistic chromatic aberration at the edges of the glass. Lighting comes from the left, creating a long, thin highlight running down the curve." Use Case: Necessary when generating non-standard shapes where standard straight-line refraction fails to capture the curvature. Adjustment: If the distortion is too weak, increase the intensity by adding "extreme curvature" or "fisheye lens effect" to exaggerate the bending of light.
Example 4: The Textured Glass Effect Prompt: "A frosted glass cosmetic bottle with a textured, pebbled surface. The glass is semi-transparent, blurring the background significantly while still allowing light to pass through. Soft, diffused lighting eliminates harsh shadows. The texture should catch the light, creating a soft glow around the edges." Use Case: Useful for designs that require a matte or frosted finish rather than crystal-clear transparency, common in luxury packaging. Adjustment: If the texture looks too rough, refine the prompt with "fine grain texture" or "smooth frosted finish" to control the level of opacity.
Example 5: The Multi-Layered Composition Prompt: "A stack of three unbranded glass vials of varying heights arranged in a row. Each vial shows independent refraction of the objects behind it. The front vial partially obscures the middle one, creating overlapping light distortions. Dramatic backlighting creates glowing edges on all three vessels." Use Case: Perfect for editorial layouts or group shots where multiple objects interact visually through shared light paths. Adjustment: If the layers merge incorrectly, specify "distinct separation" or "clear depth of field" to ensure the AI renders each layer independently.
Model Selection and Workflow Limitations
Selecting the right model variant within the Nano Banana ecosystem is critical for achieving these complex effects. Google documents Nano Banana 2 as Gemini 3.1 Flash Image, which balances speed and detail. However, if you are attempting multi-turn sequential editing or using multiple reference inputs simultaneously, you may encounter limitations. Specifically, Nano Banana 2 Lite, identified as Gemini 3.1 Flash Lite Image, is focused on speed and cost efficiency. It is not optimized for multiple reference inputs or complex sequential editing workflows. Therefore, for detailed refraction work requiring precision, the standard Nano Banana 2 or Pro versions are generally more suitable than the Lite version.
It is also important to remember that the website has a Nano Banana Pro page at /nanobananapro and a Nano Banana Lite page at /nanobananalite. However, the existence of these pages does not automatically establish identical feature support across all models. Users should verify capabilities directly within the tool. Always treat prompt examples as starting points; the final output depends on the interplay between your specific wording and the model's current interpretation. For those ready to experiment with these techniques, Try Nano Banana to access the generator and begin crafting your own realistic glass simulations.
By focusing on the physics of light and carefully selecting your model, you can transform flat, generic outputs into stunningly realistic representations of unbranded cosmetic containers.