0900:
Ready for racking, today or tomorrow.
- Malic acid: ~ 75 g/L, which is not quite complete, but no visible action. That raises the question of whether to raise the SO2 after racking or hold off. Or just not raise it too much.
- pH: ~4.4, which is really high and I'm hoping this is a bad reading. It would mean we seriously need to add tartaric acid and a really walloping dose of meta. Used a test strip color chart rather than the probe we bought years back. (That machine needs new parts that we're not going to buy this year, or maybe ever.) Will test again before using the pH to calculate how much meta to add to raise the free SO2. But will maybe pick up some tartaric acid just in case. Maybe also call Musto to see if they did any testing of pH when the grapes came in.
- Free SO2: 18 ppm.
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| Accuvin malic acid test strips, Bartovation pH test strips, & Chemetrics Titrets free SO2 test. |
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