88% Ultra-High-Hydration Glass Bread (Pan de Cristal)
Barcelona's legendary 'Glass Bread' with 88% apparent hydration, shattering paper-thin translucent crust, and 90% open air
88% Ultra-High-Hydration Glass Bread (Pan de Cristal) Baker's Formula & Schedule At A Glance
The 88% Ultra-High-Hydration Glass Bread (Pan de Cristal) is formulated at 88.0% apparent hydration (yielding 89.1% true total hydration once starter water and flour are factored in), featuring 100% Ultra-Strong High-Gluten Flour, 20% active 100%-hydration levain, and 2.2% fine sea salt. Bulk fermented at 78°F (26°C) for 4 hours in oiled glass pan with 5 coil folds until billowing, followed by Tip directly onto floured parchment, divide with oiled scraper, bake after 30m rest, and baked at 480°F (250°C) for 15m with steam, then drop to 410°F (210°C) for 13m to dry glass crust.
- Apparent Hydration
- 88.0%
- True Total Hydration
- 89.1% (+1.1% starter)
- Flour Composition
- 100% Ultra-Strong High-Gluten Flour
- Levain Inoculation
- 20.0% (100% hydration)
- Bulk Fermentation
- 78°F (26°C) for 4 hours in oiled glass pan with 5 coil folds until billowing
- Proofing Schedule
- Tip directly onto floured parchment, divide with oiled scraper, bake after 30m rest
- Bake Profile
- 480°F (250°C) for 15m with steam, then drop to 410°F (210°C) for 13m to dry glass crust
Boundary Caveat: Static gram weights for 88% Ultra-High-Hydration Glass Bread (Pan de Cristal) assume 4 Cristal Loaves (230g each / 921g total) at 88% apparent hydration (89.1% true hydration with 20% levain); if your pan volume, loaf count, or starter hydration differs from 100%, use the interactive gram scaler below to rebalance main flour and water automatically.
Dough Rheology & Handling Dynamics
Physics of gluten hydration, elasticity, and tackinessIf you dump 88% water into flour all at once, gliadin and glutenin proteins float too far apart to bond, resulting in pancake batter. By building the gluten skeleton at 66% water first and adding 22% water via staged bassinage, the protein matrix traps superheated steam into paper-thin glass walls.
Exact Gram Weights & Baker's Math
Base batch scaled for 4 Cristal Loaves (230g each / 921g total). Main flour indexed to 100.0%.
| Ingredient | Weight (g) | Baker's % |
|---|---|---|
| Ultra-Strong High-Gluten Flour (W380+ / 14.0%+ protein) | 430g | 100.0% |
| Water (Autolyse Phase) | 284g | 66.0% |
| Water (Bassinage / Salt Phase) | 94g | 21.9% |
| Active Levain (100% Hydration) | 86g | 20.0% |
| Fine Sea Salt | 9.5g | 2.2% |
| Extra Virgin Olive Oil (for pan & bowl coating) | 15g | 3.4% |
| True Total Hydration (Free Dough) | 89.1% | +1.1% vs Apparent |
Interactive Recipe Calculator & Live Timer
Adjust loaf weight, change hydration, or launch the kitchen keep-awake baking companion.
Artisan Sourdough Hydration & Dough Feel Calculator
Water percentage added to main dough
40% - 150% (50% Stiff / 100% Standard / 125% Liquid)
Salt tightens the gluten mesh and regulates fermentation rate.
Screen keep-awake • Step-by-step timer • Bulk Rise sync (282m)
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<iframe src="https://sourdoughcalc.app/embed" width="100%" height="520" style="border:1px solid #e5e7eb; border-radius:12px;" loading="lazy"></iframe> <p style="font-size:12px; color:#6b7280; text-align:right; margin-top:4px;"> Powered by <a href="https://sourdoughcalc.app/" target="_blank" rel="dofollow">SourdoughCalc – Free Sourdough Hydration & Fermentation Calculator</a> </p>
Step-by-Step Artisan Method
Carefully curated instructions designed for consistency, oven spring, and blistering.
Build Active Sourdough Levain
Phase: Levain BuildMix 1 part mature sourdough starter with 2 parts lukewarm water (78°F / 26°C) and 2 parts unbleached flour to yield at least 88g active levain (20% inoculation). Ferment for 4–5 hours until doubled, domed, and buoyant.
Enzymatic Autolyse & Hydration
Phase: AutolyseCombine the 438g total flour blend (100% Ultra-Strong High-Gluten Flour) with 289g filtered water (75% of formula water) in a broad mixing bowl. Mix until zero dry flour remains, cover, and rest for 45 minutes.
Incorporate Levain, Salt & Enrichments
Phase: Mixing & BassinageDimple 88g active levain, 9.6g fine sea salt (2.2%), and the reserved 96g bassinage water into the autolysed dough. Work using the Rubaud method or stand mixer for 4–6 minutes until smooth, incorporating any recipe enrichments.
Bulk Fermentation & Strength Folds
Phase: Bulk FermentationFerment at 78°F (26°C) for 4 hours in oiled glass pan with 5 coil folds until billowing. Perform 3 to 4 sets of stretch-and-folds or gentle coil folds spaced 30–40 minutes apart during the first 2 hours, laminating any solid inclusions at the second fold.
Portioning, Pre-Shaping & Final Shaping
Phase: ShapingTurn the aerated dough onto the work surface to yield 4 Cristal Loaves (230g each) (4 × 230g). Pre-shape gently, allow a 20-minute bench rest for gluten relaxation, then execute final shaping with taut surface skin tension.
Final Proofing & Cold Retardation
Phase: Proofing & RetardProof according to schedule: Tip directly onto floured parchment, divide with oiled scraper, bake after 30m rest. Cold retardation at 38°F (3°C) slows yeast respiration while lactobacilli synthesize complex organic flavor compounds and organic acids.
Artisan Bake & Internal Cooling Cure
Phase: Bake & CureBake at 480°F (250°C) for 15m with steam, then drop to 410°F (210°C) for 13m to dry glass crust. Remove onto a wire cooling rack immediately after baking so bottom steam escapes cleanly, and allow starches to set before slicing.
Artisan Baker's Golden Rules for this Recipe
Account for True Total Hydration (89.1%): Because a 100%-hydration levain at 20% inoculation contributes equal parts water and flour, your true dough hydration is 1.1% higher than the 88.0% apparent water ratio.
Respect Desired Dough Temperature (DDT): Target 76°F–78°F (25°C–26°C) right after mixing so wild yeast and heterofermentative lactobacilli stay in optimal metabolic balance during 78°F (26°C) for 4 hours in oiled glass pan with 5 coil folds until billowing.
Master the Handling Protocol: 25% Bassinage & Wet/Oiled Pyrex Dish Protocol: Mix only 75% of the water initially so strong gluten chains form, then trickle in the remaining 25% bassinage water over 5 minutes. Perform 5 sets of coil folds in an oiled rectangular glass dish.
Verify Thermal Doneness: Bake at 480°F (250°C) for 15m with steam, then drop to 410°F (210°C) for 13m to dry glass crust and always confirm core starch gelatinization with an instant-read thermometer before cooling on a wire rack.
Frequently Asked Questions & Troubleshooting
Q:What is the difference between 88.0% apparent hydration and 89.1% true hydration in this 88% Ultra-High-Hydration Glass Bread (Pan de Cristal)?
Apparent hydration (88.0%) only divides formula water (385g) by main flour (438g). True total hydration (89.1%) includes the 44g water and 44g flour inside your 88g sourdough levain, reflecting the real physical moisture of the dough.
Q:How can I scale this 88% Ultra-High-Hydration Glass Bread (Pan de Cristal) formula for multiple loaves or different pan sizes?
Use the live Baker's Percentage Calculator above: adjust Target Loaf Count or Target Unit Weight (default 4 × 230g = 920g batch) and every flour, water, levain, and salt gram weight recalculates automatically while preserving 88.0% hydration.
Q:Why does my dough feel stickier than expected during bulk fermentation?
If you dump 88% water into flour all at once, gliadin and glutenin proteins float too far apart to bond, resulting in pancake batter. By building the gluten skeleton at 66% water first and adding 22% water via staged bassinage, the protein matrix traps superheated steam into paper-thin glass walls. Ensure your flour meets the recommended protein spec and keep your hands lightly damp or oiled rather than adding raw bench flour.
Q:Can I cold-retard this dough longer in the refrigerator for deeper sourdough tang?
Yes! Keeping your refrigerator calibrated between 36°F and 38°F (2°C–3°C) puts wild Saccharomyces yeast into dormancy while lactic acid bacteria continue producing organic acids for up to 16–24 hours.
Plan & Troubleshoot This 88% Ultra-High-Hydration Glass Bread (Pan de Cristal) Bake
9-Stage Baking Schedule & Reverse Clock
Reverse-engineer feeding, autolyse, folding, and cold retard times from your target bake hour, then export the full 88% Ultra-High-Hydration Glass Bread (Pan de Cristal) timeline as .ics phone calendar alarms.
Crumb Doctor & Fermentation Diagnostic
Diagnose dense Fool's Crumb (underproofing), proteolytic collapse (overproofing), or hydration overshoot in this 88% dough before your next bake.
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88% Ultra-High-Hydration Glass Bread (Pan de Cristal) Equipment & Baker's Arsenal
Mastering this 88% ultra-high-hydration glass bread (pan de cristal) formula requires calibrated thermal transfer and specialized tools. Here is the verified hardware standard.
Pizzacraft 14-Inch Square Heavy-Duty Cordierite Baking Stone
Thermal-shock resistant cordierite baking stone that stores intense conductive bottom heat for pizza crusts, baguettes, ciabatta, and pita.
Fuzion 3000g / 0.1g High-Precision Digital Kitchen Baker's Scale
High-precision 0.1g digital gram scale for weighing exact hydration water splits, starter inoculation, and salt percentages.
Baker of Seville Stainless Steel Bread Lame Scoring Tool
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ThermoPro TP19H Waterproof Instant-Read Digital Dough Thermometer
Ultra-fast 1-second digital thermocouple probe for verifying Desired Dough Temperature (78°F) and internal starch gelatinization (205°F–210°F).