Malt Quality Lab Research and Results
Sorghum malt quality has to be measured. The word sorghum does not tell the brewer whether the grain germinated evenly, whether the malt was dried correctly, whether the kernels will mill cleanly, whether the mash will produce useful wort, or whether the finished beer will carry clean malt character.
Labels are useful. Supplier descriptions are useful. Brewing experience is useful. None of them replaces measurement.
Malt testing is supposed to answer practical brewing questions. Does the lot provide extract? Does it filter? Does it carry too much turbidity? Is the color where the recipe expects it? Is moisture low enough for storage confidence? Does protein suggest possible FAN, haze, body, or flavor effects? Does the malt behave like the previous lot, or did the brewery quietly receive a different ingredient?
Bard's crop-year malt comparison is useful because it makes variation visible. It does not create a universal sorghum specification. It shows that crop year, named material, malting, filtration, color, and gravity can shift while the ingredient is still called sorghum malt.
That is the reason the numbers belong in a public technical page. Not because every brewer should copy the values, and not because one crop-year row proves a best sorghum. The values show why the brewery has to test the malt in front of it. A label can stay the same while the brewing behavior changes.
The value is the comparison habit: measure, brew, record, then decide.
Bard's Sorghum Malt Comparison
The table below should be read as comparison evidence, not a universal target. Method and basis matter, and the brewer should compare like with like.
| Sample | Turbidity | Visual scale |
|---|---|---|
| 2010 | 31.3 | |
| 2011 | 149 | |
| 2012 | 7.16 | |
| 2013 Ivory | 563 | |
| 2013 BBWW | 145 |
The chart makes the process warning visible: 2013 Ivory had the highest first-pass turbidity, but the full table still has to be read because refiltered turbidity, gravity, color, and filtration also matter.
| Sample | Turbidity | Refiltered turbidity | Lovibond | Specific gravity | Filtration | Potential extract | Lovibond at 8 Plato | Reading |
|---|---|---|---|---|---|---|---|---|
| 2010 | 31.3 | Not reported | 1.58 | 1.0561 | 15-20 min | Not reported | 0.914 | Baseline crop-year reference with moderate turbidity. |
| 2011 | 149 | Not reported | 2.47 | 1.0591 | 15-20 min | Not reported | 1.360 | Higher turbidity and darker color than 2010. |
| 2012 | 7.16 | Not reported | 2.60 | 1.0870 | 15-20 min | Not reported | 0.995 | Low turbidity with higher gravity than 2010 and 2011. |
| 2013 Ivory | 563 | 35.3 | 3.805 | 1.1147 | 15 min | 0.5917 | 1.132 | Very high first-pass turbidity that dropped sharply after refiltering. |
| 2013 BBWW | 145 | 12.3 | 2.677 | 1.1144 | 15 min | 0.5904 | 0.798 | Lower refiltered turbidity than the 2013 Ivory row with similar gravity. |
| C1 | 20.2 | Not reported | 4.061 | 1.0734 | 15-20 min | Not reported | Not reported | Additional trial row with reported moisture of 7.8% and total protein dry basis near 9.12%. |
| N1 | 6.2 | Not reported | 1.998 | 1.0675 | 15-20 min | Not reported | Not reported | Additional trial row with reported moisture of 6.6% and total protein dry basis near 9.96%. |
For the 2013 comparison rows, turbidity and filtration were measured at a 3.1 liquor-to-grist ratio, while color and specific gravity were adjusted to a 2.2 liquor-to-grist basis. That matters because numbers are only comparable when the measurement basis is understood.
The practical reading is not "2013 Ivory is good" or "2013 BBWW is better." The practical reading is that similar gravity did not mean identical process behavior. Turbidity, refiltered turbidity, color, and filtration all matter.
How To Read These Measures
Each measure answers a different brewing question. One number can warn the brewer, but one number should not make the whole decision.
| Measure | Brewing question it answers |
|---|---|
| Turbidity | How much haze or suspended material is present before extra clarification or refiltering? |
| Refiltered turbidity | Does the wort clear meaningfully when passed back through the grain/filter bed? |
| Lovibond | How much color does the malt or wort contribute? |
| Specific gravity | How much extract is the malt delivering under the test conditions? |
| Filtration time | Does the sample separate easily enough for production expectations? |
| Potential extract | What yield is suggested by the test basis? |
| Lovibond at 8 Plato | How color compares at a normalized brewing concentration. |
| Moisture | Whether the malt may have storage or stability risk. |
| Total protein | A clue for FAN, haze, body, and flavor behavior. |
These measures become useful when they are tied back to the brew day. A high turbidity value matters differently if the wort clears after recirculation than if it stays loaded with suspended material. A good gravity value matters less if the beer carries rough flavor or the mash cannot separate at scale.
What The Data Shows
Bard's crop-year data should be used to sharpen evaluation, not to create one universal sorghum spec.
| Finding | Brewing meaning |
|---|---|
| Crop-year rows changed in turbidity, color, and gravity | Sorghum malt should not be treated as one static ingredient. |
| 2012 had much lower turbidity than 2011 | Year-to-year differences can be large enough to affect process decisions. |
| 2013 Ivory showed very high initial turbidity but much lower refiltered turbidity | Separation behavior can be as important as first-pass clarity. |
| 2013 Ivory and 2013 BBWW had similar specific gravity but different turbidity behavior | Similar extract does not mean identical process performance. |
| C1 and N1 differed in color, gravity, moisture, protein, and sensory notes | Additional trial lots need their own acceptance records. |
The brewer should use this kind of data to decide what to trial, what to reject, and what to watch during scale-up. The table is evidence. The beer still decides.
Practical Quality Gate
Before scaling a sorghum malt lot, the brewery should know what it is buying and how the lot behaves in its own process.
| Gate | Minimum question |
|---|---|
| Identity | What lot, crop year, cultivar, hybrid, or source material is represented? |
| Extract | Does the malt hit a useful gravity target? |
| Clarity and filtration | Does the wort separate without excessive turbidity, compaction, or sludge? |
| Color | Does the color match the recipe role? |
| Storage | Are moisture and age acceptable? |
| Sensory | Does the malt carry grain, earthy, harsh, stale, or other notes that will shape the beer? |
| Brewhouse proof | Did the lot work in the actual mash and separation process? |
Lab results do not replace brewing trials, but they keep the brewer from flying blind. A serious sorghum malt program connects lab data, batch records, and finished beer.