Glow Ink Sac drops from Glow Squids and makes sign text or item frames glow in the dark.
Guide
Dive into ocean, river, or cave water at Y=30 or below where the light level is 0.
Glow Squids spawn in groups of 2-4 and emit a soft cyan glow that is visible underwater.
Attack with a sword, trident, or bow; each Glow Squid drops 1-3 Glow Ink Sacs on death.
Right-click any placed sign with the Glow Ink Sac to make its text glow with a visible outline.
Combine 1 Item Frame and 1 Glow Ink Sac in a crafting table to make a Glow Item Frame.
Apply a regular black Ink Sac to a glowing sign to revert its text back to plain non-glowing form.
Glow Squids spawn in dark water at light level 0, usually at Y=30 or below, in any biome including ocean, river, and underground lakes.
No. Glow Ink Sac itself does not emit any light. It only makes sign text and Glow Item Frames visually glow.
Place a sign, then right-click it while holding a Glow Ink Sac. The text gains a glowing outline that stays visible in the dark.
Yes. Right-click the glowing sign with a regular black Ink Sac to revert the text to its normal non-glowing state.
Yes, Glow Ink Sac is available in both Java Edition and Bedrock Edition since the 1.17 update with identical mechanics.
Glow Ink Sac was added in Minecraft 1.17 'Caves & Cliffs Part I', released on June 8, 2021.