Fix: You downloaded an X-Ray pack by mistake. Delete it. Genuine Fullbright keeps block textures; it only removes shadows.
Download for version 1.12.2 from the official website. minecraft 1122 fullbright texture pack updated
No more pitch-black caves. No more squinting at your monitor. You see the entire cave system clearly, even without a single torch. Fix: You downloaded an X-Ray pack by mistake
Download a pack that suits your needs, follow the installation steps, and enjoy . follow the installation steps
A "universal" pack that works across nearly all versions, including 1.12.2, without requiring Optifine. How to Install on Minecraft 1.12.2
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Your game looks exactly the same, just completely illuminated.