The Blue Colour Outline Glass Block is a hollow unit at 190x190x90mm, sold six pieces per box, with colour applied specifically to the outer rim of the block rather than across the whole face — a vivid blue frame surrounding a clear, gently sand-textured centre panel. This is a fundamentally different colour application from the Full Color Blocks range, where saturated colour fills the entire block face; here, colour is a deliberate accent at the edge only.

The clear centre panel carries a subtle sand-like texture rather than full transparency, softening the view through the middle of the block while the coloured rim provides the visual definition and colour statement. Arranged across a multi-block wall, this creates a grid-like visual rhythm where the blue outlines trace the boundary of every individual block clearly, making the underlying modular structure of the wall a deliberate part of the design rather than something a continuous pattern would obscure.

This outline-only colour treatment makes Blue Colour Outline a genuinely different design tool from a fully coloured block — suited to projects wanting colour as a graphic, structural accent defining the grid itself, rather than a wash of colour across the whole surface. The sealed internal air chamber provides the same genuine thermal and acoustic insulation as every other glass block in T21's range.

Hollow glass block, 190x190x90mm, 6 pieces per box. Dispatched from Bengaluru. All India delivery. WhatsApp +91 94484 64040.

How does Colour Outline Blue differ from a Full Color Blue block in the same 190x190x90mm format?

Colour Outline applies blue only to the block's outer rim, framing a clear, lightly textured centre panel. Full Color fills the entire block face with saturated blue. Both share the same dimensions and insulation performance — the difference is purely how and where the colour is applied across the block.

What visual effect does the outline-only colour treatment create across a wall of multiple blocks?

It creates a grid-like rhythm where the coloured rim traces the boundary of every individual block clearly, making the underlying modular structure of the wall a visible, deliberate part of the design rather than blending into one continuous coloured surface. Electrical and installation planning for an outline-pattern wall should account for this visible grid effect from the outset, since the coloured rims will clearly show any inconsistency in block alignment or jointing that a fully coloured or more heavily textured block might otherwise help disguise.