Opal
Alpha acid
5–14%
Beta acid
3.5–5.5%
Total oil
0.8–1.3 mL
Germany
Stirling
Alpha acid
6–12%
Beta acid
4–6%
Total oil
1.3–1.9 mL
United States
Key differences
When to pick Opal
- Richer, more complex aroma profile
When to pick Stirling
- More essential oils - more intense aroma
- More myrcene - pronounced citrus and resinous notes
Aroma profile and use
Shared aromas
SpicyFloralHerbal
Only in Opal
Black currantCitrusAnise
Only in Stirling
Citus
Property
| Property | Opal | Stirling |
|---|---|---|
| Alpha acid | 5–14% | 6–12% |
| Beta acid | 3.5–5.5% | 4–6% |
| Co-humulone | 13–34% | 21–28% |
| Total oil | 0.8–1.3 mL | 1.3–1.9 mL |
| Myrcene | 20–45% | 44–48% |
| Humulene | 30–50% | 19–23% |
| Caryophyllene | 8–15% | 5–7% |
| Farnesene | 0–1% | 11–17% |
| Origin | Germany | United States |
| Purpose | Dual purpose | Dual purpose |
Styrian Golding