Malt Types
Not all sorghum malt is the same. The term "sorghum malt" covers a range of products from pale base malt optimized for enzyme activity and light lager production to deeply roasted specialty malts with no enzymatic activity at all. Understanding malt types means understanding what kilning and roasting temperature does to grain — and choosing the right type for the intended brewing outcome.
For Bard's, the primary production malt was a pale base malt made from burgundy sorghum. Other types were available or under development, including roasted specialty malts produced exclusively by Missouri Malting under contract.
What This Page Is Built to Answer
- What categories of sorghum malt exist?
- How does kilning temperature determine malt type?
- What role did each type play in Bard's brewing?
- What specialty malt development was pursued for gluten-free applications?
Malt Type Categories
Sorghum malts can be grouped by the temperature and duration of the kilning or roasting step. Each temperature range produces a different flavor, color, and enzymatic profile.
Base malt — Produced at low kilning temperatures (50–65°C). Maximum enzyme preservation. Light grain flavor, pale color (1–3°SRM typical). The primary grain in Bard's production malt bill. Most sorghum malt used commercially falls into this category.
Vienna and higher-color malt — Kilned at slightly elevated temperatures or for extended duration. Some browning chemistry (Maillard development) produces amber character and mildly toasted flavor. Diastatic power (enzyme capacity) reduced but not destroyed. Used for color adjustment and flavor depth without losing all enzyme activity.
Biscuit and aroma malts — Kilned at moderate-high temperatures. More pronounced Maillard development: biscuit, toast, and nutty notes. Enzymatic activity substantially reduced. Added to grain bill for flavor complexity rather than starch conversion.
Chocolate and dark roast malts — High-temperature roasting. Enzymes destroyed. Deep color (hundreds of EBC units) and intense flavor: chocolate, coffee, dark fruit. For Bard's, production of these types was exclusively controlled by Missouri Malting under the exclusive provider agreement.
Custom and experimental malts — Malts developed for specific flavor targets or non-brewing applications. Bard's explored custom malt development through Missouri Malting for specialty and limited-release products.
What This Section Covers
- Base Malt — pale sorghum lager malt, enzyme profile, Bard's production malt
- Vienna and Higher-Color Malts — intermediate color range, flavor development, kilning decisions
- Biscuit and Aroma Roasts — moderate-roast flavor malts for specialty applications
- Chocolate and Dark Roasts — high-roast specialty malts, color development, roasting exclusivity
- Custom Gluten-Free Malts — new malt development, non-brewing applications, Bard's platform strategy
Core Principle
Malt type is determined at the kiln. Every grain starts the same way — steeped, germinated, green. What happens at kilning temperature defines whether it becomes a base malt that converts starch or a specialty malt that adds color and flavor.
Common Failure Modes
Spec drift - Accepting lots without trend checks creates hidden inconsistency.
Process drift - Small timing or temperature changes compound into material performance loss.
Feedback lag - Waiting for finished-beer problems before adjusting malt decisions increases cost and rework.
Practical Win Conditions
Use clear release criteria, monitor lot trends, and close the loop between malt metrics and production outcomes. Teams that do this get stable quality and fewer downstream surprises.
Key Takeaway
Use this page as a decision aid: define the target outcome, check the process variables, and validate with quality data before scaling.
Quick Reference
| Decision Area | What to Check | Why It Matters |
|---|---|---|
| Input quality | Lot specs and source consistency | Prevents avoidable downstream variability |
| Process control | Temperature, timing, and handling discipline | Keeps results repeatable batch to batch |
| Outcome check | Performance and sensory fit to purpose | Confirms the malt is usable in production |
Source Notes / Confidence
- Strongly supported: Malt type classification by kilning temperature (standard malting science); Bard's use of pale burgundy sorghum base malt (archive, LH production method); Missouri Malting roasting exclusivity (Exclusive Provider Agreement, Paragraph 9)
- Partially supported: Intermediate color and biscuit malt categories applied to sorghum (barley malting science framework — sorghum-specific data limited)
- Needs review: Specific sorghum malt color targets for each type category (no direct archive data for specialty types)