At Valentine Clays, one of the questions we’re often asked is:
“Why can’t Bistro Porcelain Clay Body just be turned into a casting slip using a recipe, like other clay bodies?”
It’s a fair question, especially when many traditional clay bodies can be adapted between throwing, hand-building, and casting versions with only minor adjustments. But Bistro Porcelain is a little different.
Bistro was originally developed with one clear purpose in mind: to create an exceptionally strong, durable porcelain that still feels beautifully workable on the wheel. Achieving that balance required a carefully selected blend of ingredients that give the body its distinctive throwing qualities, smooth handling, and resilience during making and firing.
The challenge is that the very ingredients that make Bistro perform so well in a plastic, pugged form are not compatible with the demands of slip casting.
Casting slips behave very differently to plastic clay bodies. A successful casting slip must disperse evenly in water, remain stable in a liquid state, drain consistently in the mould, and build an even wall thickness during casting. Some of the materials used in Bistro Porcelain to enhance wheel performance simply do not allow the body to deflocculate and suspend correctly as a liquid casting slip.
In simple terms, the clay can’t behave as both things at once.
If we attempted to convert the original Bistro pugged body directly into a casting slip, the result would be inconsistent performance, poor casting behaviour, and a slip that simply wouldn’t meet the standards makers expect from a professional casting body.
That’s why our new Bistro Porcelain Casting Slip is not just the original recipe with ingredients added.
Instead, we took the core principles that make Bistro so successful of strength, durability, thermal shock resistance, and refined porcelain character and developed an entirely new formulation specifically engineered for slip casting.
The result is a casting slip that captures the spirit of Bistro while performing exactly as a casting body should. It drains cleanly, casts reliably, offers excellent strength, and maintains the smooth, refined finish associated with the Bistro range.
By developing a dedicated casting formulation rather than forcing the original body to behave in a way it wasn’t designed to, we’ve been able to create a material that truly delivers for casters, studios, and hospitality makers alike.
Because sometimes the best results come not from adapting a material beyond its limits, but from designing the right material for the job from the very beginning.
Bistro Porcelain Casting Slip launches in June.