The Seger unity calculator converts a glaze recipe (a list of raw materials and the amount of each) into its unity formula: the oxide breakdown that recipe actually supplies, normalized so the flux oxides sum to 1 mole. That normalized form is what makes it possible to compare two glazes built from completely different raw materials on equal terms, and to reason about a glaze's likely behavior (melt fluidity, durability, thermal expansion) directly from its chemistry.
A representative cone 10 feldspathic clear might resolve to a unity formula something like this:
| Oxide | Unity value |
|---|---|
| K₂O + Na₂O | 0.62 |
| CaO | 0.38 |
| Al₂O₃ | 0.42 |
| SiO₂ | 3.9 |
| Si : Al ratio | 9.3 : 1 |
A few things are worth reading directly off a table like this once it exists. The Si : Al ratio (here, roughly 9:1) is a quick, widely-used proxy for surface quality: a much lower ratio tends toward matte, underfired-looking surfaces, while a much higher one tends toward a thin, runny glaze, with a broad workable middle ground in between depending on the rest of the chemistry. The total flux value is fixed at 1.0 by definition (that is what "unity" means), so what actually varies between recipes is the ratio of fluxes to each other (here, roughly two-thirds alkali to one-third calcia) and how much glass former and stabilizer that fixed flux total is able to carry into a stable melt.
The original design called for this to be an actual interactive tool: enter a recipe, get a live oxide breakdown, see it plotted against a Stull chart, the same way the standalone prototype works. That did not make it into this pass. Wiki.js's Markdown renderer strips <script> tags by default (a sensible security default, not a bug), and iframes are disabled out of the box too. A real interactive version needs either a dedicated Wiki.js plugin (a proper renderer module, not just page content) or a small custom-built tool hosted alongside the wiki and linked from here. This is one of the concrete cases from the platform evaluation where Wiki.js's content model genuinely runs out of runway and something custom is the honest answer.