What is the excused legal limit for a liquid Heavy Impurity (like wine or blood) on a garment?

Excused Limits of Impurities and Wiping/Sprinkling Rules

• Up to the weight of 10 grams.
• Up to the surface area of a dirham coin (approx. 3 cm in diameter / the hollow of the palm). / ایک درہم کے سائز (تقریباً ۳ سینٹی میٹر قطر
• Up to a quarter of the garment.
• There is no excused limit; even a single molecule invalidates prayer.