Glazecalc
Ceramic glaze chemistry: unity formulas, limit checks, substitutes, cones and potters' guides.
| Endpoint | https://glazecalcapp.com/mcp (streamable-http) |
|---|---|
| Registry version | 1.4.0 |
| Now | 34 tools · grade D (53) · pin ts_5c6caef41cce1cae9566d4980342ac5a · protocol 2025-06-18 |
| First / last listed | 2026-11-11 02:16 UTC / 2026-11-11 02:16 UTC |
| Grade over time | 2026-11-11: D (53), 34 tools |
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Tools: search_materials get_material analyze_recipe check_limits convert_cone_temperature specific_gravity_water suggest_substitutes match_from_materials solve_target blend_recipes vary_material compare_recipes search_guides list_recipes get_recipe list_my_materials get_shelf match_with_what_i_have list_firings get_firing list_notes get_my_settings create_recipe update_recipe add_notebook_entry add_my_material update_my_material add_to_shelf remove_from_shelf undo_shelf_change move_to_trash create_firing_log add_firing_rows link_firing
search_materials | Finds ceramic raw materials (feldspars, clays, frits, fluxes) and, if asked, colorants in Glazecalc's library by name, alias or maker. Use it to find the exact name the other tools take. params: query*, includeColorants, category, region, limit |
get_material | One material from Glazecalc's library: its oxides, loss on ignition, whether it is discontinued and what replaces it, where it is sold, hazards and the data sheet it comes from. params: name* |
analyze_recipe | Works out a glaze recipe's unity (Seger) formula, oxide groups, silica to alumina ratio, fired analysis, loss on ignition and calculated thermal expansion, as the Glazecalc app does. stull says where the recipe sits on Stull's chart (1912, as the recipe page draws it): silica and alumina in moles, the region (unfused, matte, semi-matte, bright or underfired) and whether it falls in the crazed area params: lines*, language |
check_limits | Checks a glaze recipe for what is past a recommended limit for its firing (too much boron or alkali, too little alumina, too little or too much clay, rising expansion...) and says what the fired glaze will likely do, as the Glazecalc app does. A cone is checked in the band the recipe page gives it (low cone 06-02, mid 1-7, high 8-11); from cone 12 up (band 'top') no published limits reach, so the params: lines*, firing, limitSet, language |
convert_cone_temperature | Converts between a pyrometric cone and its temperature, and between °C and °F. Orton cones run 022 to 42: Glazecalc's figure, from 022 to 15, is Orton's older chart for large cones at 150 °C an hour, and Orton's current figures (self-supporting cones at 15, 60 and 150 °C an hour, large cones at 60 and 150, cone 022 to 14) come beside it; Orton publishes no figure above cone 14, so cones from 16 up params: cone, chart, celsius, fahrenheit |
specific_gravity_water | Works out a glaze slurry's specific gravity (SG) from the grams 100 mL of it weighs (or takes the SG), then, for a bucket of it and a target SG, the water to add, or to pour off after the glaze settles, as the recipe page's Specific gravity and water does. The water to add needs nothing else. The dry glaze per litre and the dry glaze and water the bucket holds (Brongniart's formula) need the dry m params: gramsPer100ml, sg, litres, target, drySg, lines |
suggest_substitutes | Finds the discontinued or scarce materials in a recipe and the modern ones that replace them, then suggests amounts that keep the unity formula as near as the materials allow, as the Glazecalc app does. report.closeness says how near the new unity formula comes to the old, oxide by oxide, as match_from_materials does. Test any suggestion before using it. params: lines*, region, allowLead, allowMore, language |
match_from_materials | Remakes a glaze recipe from only the materials listed in "have", keeping its unity formula as near as they allow, as Match with what I have does in the Glazecalc app. report.closeness says how near the new unity formula comes to the old, oxide by oxide: close (within 0.02, or 5% of a large amount such as silica's), off, or far (more than three times that), with a verdict (close, fair or poor) and params: lines*, have*, mustUse, allowMore, language |
solve_target | Makes a glaze recipe, in percent, from the materials given whose unity formula comes as near a target as they allow (Solve for a target in the Glazecalc app). The target is a unity formula (moles; the fluxes are scaled to add up to 1) or an oxide analysis (percent by weight of the fired glaze), with potash and soda apart. Give the materials by their library names, or onHand for the materials on th params: target*, materials, onHand, mustUse, allowMore, firing, language |
blend_recipes | Works out the test tiles of a line blend between recipes a and b (2 to 11 steps), or of a triaxial blend when c is given too (2 to 6 rows, up to 21 tiles), as the Blends page of the Glazecalc app does. Each tile is a mix of the corner recipes, each taken as a percent of its base: its shares, its recipe in percent, its key unity formula figures (silica, alumina, boron, the fluxes), silica to alumin params: a*, b*, c, steps, firing, limitSet, language |
vary_material | Shows what one material does to a glaze, by putting more and more of it into a base recipe (an ingredient blend or progression test: whiting 0 to 20, say, in 2 to 11 tiles). With mode "add" (the default) it goes on top of the base, so the recipe grows; with mode "replace" the same amount comes out of another material of the base (`instead`), so the total stays the same. Each tile has its amount of params: recipe*, material*, from, to*, steps, mode, instead, firing, limitSet, language |
compare_recipes | Compares two glaze recipes side by side: for each, its recipe in percent, key unity formula figures, flux ratio (R2O against RO), silica to alumina, calculated expansion, place on Stull's chart (stull), the names of the limit cautions it has and, with a firing, whether its chemistry fits that firing (coneFit verdict); then what changes from A to B oxide by oxide (differences), which materials are params: a, b, aRecipeId, bRecipeId, labels, firing, limitSet, language |
search_guides | Searches Glazecalc's plain-language guides for potters (glazing from first principles, making a glaze, safe mixing, safety at home with children and pets, firing a kiln, and a companion to John Britt's free glaze course, in English only) in the language asked for, or in English where that language has no match. Returns each matching section's title, anchor, a short excerpt, its address on the webs params: query*, language, guide, cones, limit |
list_recipes | Lists the glaze recipes saved in your Glazecalc account, newest first, optionally only those whose title or a material matches a search, or whose stated firing includes a cone or names an atmosphere or process ("which of my glazes fire at cone 10 reduction?"). Each lists its stated firing; a recipe with none has not stated one. params: search, cone, scale, atmosphere, process, limit, offset |
get_recipe | One recipe from your account: its materials and amounts, colorants, notes, its stated firing (firedAt: the cone scale, the low and optional high cone of the claimed range, the cones the potter has test-fired, left out when none is ticked, because a stated cone from a book is not a tested one; the atmospheres and processes, and for a temperature the rate and hold; each cone exactly as the potter ga params: id*, firing, language |
list_my_materials | Lists the materials you have saved in your own Glazecalc account (not the shared library), with their oxides. params: search, limit, offset |
get_shelf | The materials you marked as on hand in Glazecalc (the shelf that Match with what I have uses). params: none |
match_with_what_i_have | Remakes one of your recipes, or a recipe you give, from only the materials on your shelf, keeping its unity formula as near as they allow (Match with what I have). report.closeness says how near the new unity formula comes to the old, oxide by oxide, as match_from_materials does. Test any suggestion before using it. params: recipeId, lines, allowMore, language |
list_firings | Lists the firing logs saved in your Glazecalc account, newest first. params: search, limit, offset |
get_firing | One firing log from your account: its columns (time, temperature, cone...) and rows, and its notes. params: id* |
list_notes | The notes in your Glazecalc notebook, newest first, optionally only those about one record (a recipe, material or firing log id). params: search, about, limit, offset |
get_my_settings | Your Glazecalc settings that matter when talking about glazes: region, temperature scale, cones, language, weight unit, whether lead may be suggested, the limit set recipes are checked against, the currency your prices are in (never the prices), and whether changes made by assistants wait for your approval on the website (confirmChanges: off, removals or all; it can be changed only there). params: none |
create_recipe | Saves a new glaze recipe in your Glazecalc account, from its base materials and amounts (the library's names, or your own materials'), with optional colorants, notes, firing band and food-surface mark. Glazecalc works out its unity formula, as the recipe page does, and answers with it. Save only a recipe the person asked to save. Needs an access token that can read and change your records. params: title*, lines*, colorants, notes, firing, foodSurface, language |
update_recipe | Changes one of your saved recipes (an id from list_recipes): its title, its base materials and amounts (the unity formula is worked out again), its notes, firing band or food-surface mark. Only what is given changes. The recipe as it was is kept as an earlier version, so the person can undo the change on the website. Needs an access token that can read and change your records. params: id*, rev, title, lines, notes, firing, foodSurface, language |
add_notebook_entry | Adds an entry to your Glazecalc notebook (the Notebook page), with an optional title: a test result, an observation, a firing to try. With about, it is a note about one of your recipes, materials or firing logs, which list_notes finds by that record's id. Needs an access token that can read and change your records. params: content*, title, about |
add_my_material | Saves a material of your own in your Glazecalc account (the Materials page) from its oxide analysis in weight percent, as on a data sheet, with its loss on ignition. Recipes can then use it by name. Needs an access token that can read and change your records. params: name*, analysis*, loi, notes, language |
update_my_material | Changes one of your own materials (an id from list_my_materials): its name, oxide analysis in weight percent, loss on ignition or notes. Only what is given changes. Recipes already saved keep their own copy of it. The material as it was is kept as an earlier version, so the person can undo the change on the website. Needs an access token that can read and change your records. params: id*, rev, name, analysis, loi, notes, language |
add_to_shelf | Marks materials as on hand (the shelf that Match with what I have uses), by the library's names or your own materials'. The shelf as it was is kept: undo_shelf_change puts it back. Needs an access token that can read and change your records. params: materials* |
remove_from_shelf | Takes materials off the shelf of materials on hand, by name. The materials themselves stay. The shelf as it was is kept: undo_shelf_change puts it back. Needs an access token that can read and change your records. params: materials* |
undo_shelf_change | Puts back the shelf as it was before its last change (by the website, an access token or an assistant). One step back only: a second call finds nothing to undo until the shelf changes again. Needs an access token that can read and change your records. params: none |
move_to_trash | Moves one of your recipes, materials, notebook entries or firing logs to the Trash, as removing it on the website does. It can be put back from the Trash on the website for 30 days; nothing is deleted for good. A token moves at most 100 an hour, and none while the Trash is full. Remove only what the person asked to remove. Needs an access token that can read and change your records. params: kind*, id*, rev |
create_firing_log | Saves a new firing log in your Glazecalc account (the Firing page): its title, the day, the kiln, the columns kept (time, temperature, cone, atmosphere, comments...) and a row for each reading, as the person dictated them. Add later readings with add_firing_rows. Save only what the person said and agreed to; never fill in an amount, temperature or analysis they did not give. Needs an access token params: title*, date, kiln, columns*, rows*, notes |
add_firing_rows | Adds rows to the end of one of your firing logs (an id from list_firings), in the log's own columns (get_firing gives them): the readings dictated during a firing. The rows already there stay as they are, and the log as it was is kept as an earlier version. At most 500 rows a log. Save only what the person said and agreed to; never fill in an amount, temperature or analysis they did not give. Need params: id*, rev, rows* |
link_firing | Links one of your recipes to a firing log it went through, as the recipe page does, and sets what came of it there: the result in the person's words (at most 500 characters), and the cone and atmosphere when they differ from the log. Linked already, it changes only what is given. A recipe links to at most 100 logs. Taking a link off is done on the website. Save only what the person said and agreed params: recipeId*, firingId*, result, cone, atmosphere |
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