
Yellow Chartreuse is the milder of the two Carthusian herbal liqueurs: sweeter and lower in strength than the green, honeyed and saffron-gold rather than sharp.
Bénédictine
The nearest swap, one for one. It is also honeyed and herbal, slightly lower in strength and about as sweet.
Green Chartreuse
Use this where the drink already has Bénédictine. It is stronger and drier, so use about three-quarters of the measure and add a scant barspoon of syrup per 25 ml.
Works only in a pinch. The drink turns drier and more bitter, so add a little syrup.
Yellow Twilight
Chamomile cordial