Tri Blend Citrus Markers by Spectrum Noir from Crafter's Companion! This pen contains three ready-to-blend colors in yellow shades that are alcohol pens for seamless coloring! Inside each marker, there are three separate ink chambers, each feeding through to a fine-bullet nib, so you can experience three colors inside a single alcohol marker for the first time. Because they're transparent alcohol-based inks, it's easy to blend from lights to darks without overlap marks and the pens are refillable.
More Tri Blend from Crafter's Companion: Gold Brown (
link), Dull Green (
link), Green Turquoise (
link), Hydrangea (
link), Lavender (
link), Pale Pink (
link) and Ice Blue (
link).