Where the wax comes from
Updated
The first material decision, and the one where a product number matters more than a material name.
Buy by product number
"Soy wax" is a category. Two container soy waxes from different manufacturers behave differently enough to need separate testing.
So the thing you record and reorder is the manufacturer's product number, not the type. A formula sheet that says "soy wax" is not reproducible.
The supply chains
Candle supply houses, which sell in bags and small cases and carry wax, wicks and fragrance together. The right starting point.
Distributors, at pallet quantities, once you know exactly what you want.
Beeswax is different again: it comes from beekeepers and renderers, varies by season and hive, and is the one wax where a local material story is available.
What to ask for
The technical data sheet: melt point, recommended pour temperature, fragrance addition temperature, maximum fragrance load, cure time.
Those five numbers are your process. A supplier who cannot provide them is selling wax rather than supporting a product.
And the lot number, written on the bag the day it arrives.
Buying quantity
Wax keeps, so the volume discount is real and low risk, as long as you have somewhere cool to store it.
The catch is reformulation. A supplier changing the formulation of a product number, or a natural wax varying between lots, invalidates your testing, and a pallet of a wax that no longer behaves like the one you tested is an expensive way to learn that.
Which is why a bag from the new lot gets a confirmation burn before the pallet gets used.