Tartrate (Cold) Stability Testing
Cellar Dweller uses a Stabilab to test wines prior to STARS treatment or to check wine for tartrate instability. These tests are more repeatable and reliable than “freezer” tests.
- DIT tartaric instability test – determines the precise level of de-ionization required to ensure the best possible stability of wine.
- ICST 50 test – verifies the effectiveness of the stabilization treatment and which therefore provides a definitive guarantee of the stability of the wine
- Davis test – a shorter test which verifies the stability of wine at a customer specified temperature. We recommend the longer ICST 50 test, as the Davis test may indicate a false pass for some colloid rich wines and for some red wines.
Testing filterability will provide winemakers with a measure of how well the wine will perform in the final filtration during bottling. Filterability of wine is typically a function of turbidity, with wines under 1 ntu turbidity having acceptable filterability. However, wines with low turbidity may still have a poor filterability due to colloidal compounds. If filterability is poor, the winemaker will have the chance to apply palliative treatments, ensuring homogeneity and avoiding problems during bottling.
When crossflow filtering at a client, Cellar Dweller performs a filterability and turbidity test on all wines, and informs customers on any potential problems. Filterability tests should be conducted as close to bottling as possible, as wines with high colloidal compounds may have filterability decrease over the space of a few days.