Silk | Milk Jug by Nucleus Coffee Tools
Silk redefines what a milk jug can do.
Developed by Nucleus Coffee Tools in collaboration with researchers at RMIT University, Silk was engineered to improve the quality of textured milk through scientifically optimised jug geometry. Rather than focusing solely on pouring performance, Silk enhances three critical stages of milk steaming: Milk Acceleration, Milk Movement and Milk Stability.
By accelerating milk circulation earlier in the steaming process, Silk provides more effective folding before milk reaches serving temperature. Its optimised geometry distributes air integration more evenly, creating finer, more consistent microfoam with improved stability. Independent testing also demonstrated reduced bubble merging and approximately 20% slower foam separation than a conventional milk jug.
The result is sweeter, creamier milk with a smoother mouthfeel, improved latte art performance and greater consistency, making professional-quality milk easier to achieve on both commercial and home espresso machines.
Features and specifications
- Available in 400 mL and 600 mL
- Engineered to improve Milk Acceleration, Milk Movement and Milk Stability
- Developed with researchers at RMIT University, Melbourne
- Independent testing found reduced bubble merging and about 20% slower foam separation than a conventional milk jug
- Strengthens protein bonds around air bubbles and distributes fat more evenly through the milk
- Smoother, creamier milk with finer, longer-lasting microfoam
- Consistent results on both commercial and home espresso machines
- Professional-quality milk texturing, whatever your machine or experience
- Ergonomic angled handle and precision spout for comfort and latte art control
- Premium food-grade stainless steel
Silk.
Designed for texturing.
Up to 67% more microfoam from the same milk
Most milk pitchers are designed for pouring. Silk's angled lower body sends the milk back through the steam again and again, dividing the air into finer, more even bubbles for denser, silkier microfoam.
Same milk, same machine, same technique. Only the pitcher changes.
Dual milk movement.
Built into the shape.
The difference starts at the bottom of the jug. Here is what happens to the milk, step by step.
The round base
Milk drifts past the steam.
- In a conventional jug, milk follows a wide, smooth loop around the rounded bottom.
- Much of it never returns to the steam tip, so air is left in larger, uneven pockets.
- The result is coarser foam that drains and separates faster, leaving a dry cap on thin milk.
Dual movement
Spin, then return to the steam.
- Movement one: the spin. The steam drives the milk into a rotating vortex, as in any jug.
- Movement two: the return. Silk's angled lower body catches the milk on its way down and sends it back through the steam again.
- Pass after pass, the air is divided into finer, more even bubbles, and the proteins are spread evenly enough to coat each one.
RMIT University's explanation of how the shape works, consistent with every result they measured. The flow itself was not measured directly.
The result
Finer foam that holds.
- Up to 67% more microfoam from the same milk and the same technique.
- Finer, more uniform bubbles with proteins and fat spread evenly through the milk.
- Foam that lasts. About twice as much was still standing after 30 minutes, over thicker, silkier milk.
For anyone who makes milk drinks and cares how they taste.
You steam with Silk the same way you steam with any other jug. The shape does the rest. So whether you're making your very first latte or competing on stage, there's no reason to wait.
The foam comes out creamier, lasts longer and stays bound to the milk. No more stiff, airy foam on top of thin, watery milk. Just one smooth, velvety texture from the first sip to the last.
Silk is designed for steaming, not latte art. For your best pours, steam in Silk and pour into your favourite latte art pitcher.
FAQ
Here you find answers to frequently asked questions about the Silk.
What is the Silk?
The Silk is a next-generation milk frothing jug designed to improve the consistency and quality of milk texturing, giving baristas greater control over the creation of smooth, silky microfoam.
Through its innovative internal geometry, Silk promotes Rapid Air Integration and creates a Dual Movement within the milk - combining horizontal rotation with vertical folding to break down larger bubbles and produce a finer, more uniform texture with stronger, elastic protein bonds.
Designed to address common challenges in milk preparation, Silk helps baristas achieve consistent, stable microfoam with less effort, making it easier to produce glossy, beautifully textured milk for milk-based
Is Silk a Milk Jug?
Yes, but not as you know it.
While most innovations in milk jugs have focused on spout design, pouring precision and latte art, Silk is engineered specifically to improve texture and taste.
Researched in collaboration with the Department of Food Technology and Nutrition at RMIT University in Melbourne, Silk takes a science-led approach to milk preparation - exploring how fluid dynamics, bubble size and foam stability influence milk, and impact the sensory experience of milk-based coffee.
The result is a fundamentally different approach to milk jug design. Rather than simply improving how milk is poured, Silk is engineered to improve the milk itself - creating finer, more consistent microfoam that enhances sweetness, mouthfeel and the overall drinking
How does the Silk work?
Silk is the result of extensive experimentation and research into the science of milk texturing.
Unlike conventional milk jugs, Silk uses specially engineered internal geometry to optimise three critical aspects of milk preparation:
- Milk Acceleration: internal design promotes faster, more efficient milk circulation, creating the ideal conditions for incorporating air and allowing milk proteins to surround and stabilise newly formed bubbles.
- Milk Movement: A unique dual-vortex effect combines horizontal rotation with vertical folding, distributing air throughout the milk and helping break larger bubbles into finer, more uniform microfoam.
- Milk Stability: By promoting smaller, more consistent bubbles and supporting the stabilising role of milk proteins, Silk helps create longer-lasting microfoam with a smoother texture, silkier mouthfeel and improved sensory
Why was the Silk created?
Silk was born from a simple question: What if we could improve the taste of milk-based coffee by changing the way milk is textured?
For Nucleus Coffee Tools' head of Research and Development, Angus Mackie, the journey began with a desire to understand why milk texture could vary so dramatically, even when using the same equipment and techniques.
Inconsistent aeration, large bubbles and unstable microfoam can all affect mouthfeel and the overall drinking experience of milk coffees.
Rather than accepting these limitations as part of milk steaming, Angus and our team set out to explore whether the design of the jug itself could offer a solution.
Is Silk suitable for home users, or is it designed for professional baristas?
Silk is designed for everyone, from experienced baristas working in high-volume cafés to home coffee enthusiasts looking to improve their milk texturing.
One of the biggest challenges in steaming milk is achieving consistent results. Small differences in steam wand positioning, aeration and technique can significantly affect the final texture, making it difficult to produce the same quality of microfoam every time.
Silk's engineered internal geometry helps create more controlled and consistent milk movement, reducing the reliance on highly refined steaming techniques to achieve great results.
For beginners and home users, this means a more forgiving and accessible milk texturing experience.
For professionals, it means greater repeatability, efficiency and consistency, even during busy service periods.
Does Silk work with all espresso machines and steam wands?
The Silk is designed to work with a wide range of commercial and domestic espresso machines, without requiring any additional equipment or modifications.
Its unique internal geometry is engineered to optimise milk movement during steaming, helping create finer, more consistent microfoam across different steam wand configurations and pressure levels.
While results may vary depending on the machine, milk type and steaming technique, Silk can be incorporated into almost any existing workflow - making it accessible to both professional baristas and home coffee
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