Start here: colour and grip are different measurements
Build the basic mechanism before drawing conclusions.
The argument
What this chapter will give you
Separate extraction, visible colour, pigment stability, and astringency.
This is a reading chapter, not a definition enlarged to fill a screen. Its sections build the idea from mechanism and method to the language you can use in front of an actual glass.
Start here: colour and grip are different measurements
Anthocyanins are pigments that contribute red and purple colour, usually extracted from red grape skins. Tannins are a different group of phenolic compounds involved in tactile astringency and reactions with pigments. Extraction moves material from grape solids into liquid. Once there, pigment chemistry and the surrounding matrix affect the colour seen. pH changes the balance of pigment forms; sulfur dioxide can temporarily bleach some anthocyanin colour; association with other molecules, called copigmentation, can alter intensity. The amount extracted and the appearance later are related but distinct questions.
What is happening
Anthocyanins contribute red and purple colour, while tannins and other phenolics influence reactions, stability, and tactile perception.
Bring it back to the glass
Three checks before the conclusion
- Name the process or growth stage before explaining its consequence.
- Use the worked example to distinguish an observation from its possible cause.
- Identify the missing evidence before applying the explanation to a real bottle.
The language bench
Solid things you can actually say
Use these as sentence shapes, not answers to copy. Replace the details with what your glass can defend.
Start here: colour and grip are different measurements
- “Anthocyanins are pigments that contribute red and purple colour, usually extracted from red grape skins.”
Worked example: equal pigment does not mean equal appearance
- “Imagine two model samples containing the same amount of anthocyanin but different pH.”
What can the explanation support?
- “Colour amount, colour appearance, stability, and tactile grip are related questions—not interchangeable shortcuts.”
Make the sentence earn its keep
“That one clue proves the whole story.”
“Colour amount, colour appearance, stability, and tactile grip are related questions—not interchangeable shortcuts.”
Keep the mechanism specific and match confidence to the available evidence.
Try it now
A five-minute field exercise
- Can the eye rank astringency reliably from colour alone?
- Write your answer and its reason before reading the explanation.
- Answer: No. Pigment appearance and tactile grip depend on different interacting variables. Write four separate questions: what was extracted, what colour is visible, how stable is that colour, and what drying sensation occurs? Match an observation to each. A photograph can support the second question under stated lighting; it cannot answer all four.
The line worth keepingColour amount, colour appearance, stability, and tactile grip are related questions—not interchangeable shortcuts.