The Red Colour Outline Glass Block is a hollow unit at 190x190x90mm, sold six pieces per box, with a bold red frame applied to the block's outer rim, surrounding the same clear, sand-textured centre panel shared across the Colour Outline range. Red is the most visually assertive colour in this six-shade line, reading as a confident, high-energy accent even in this restrained outline format.

Because Red's intensity carries through clearly regardless of how much surface area the colour actually covers, the outline treatment is a particularly effective way to introduce this bold colour without the visual weight a full-face Red block would bring to a larger wall — the rim reads as a clear, deliberate accent line rather than a potentially overwhelming wash of red across the whole surface.

Within a mixed Colour Outline installation, Red provides strong visual punctuation alongside calmer shades like Green or the lighter warmth of Yellow — a single Red-outlined block, or a deliberate scattering of them within a larger pattern, draws the eye in a way the more neutral colours in the range don't, making it a useful tool for guiding attention to a specific point within a composition.

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

Does Red Colour Outline still read as a bold, attention-grabbing colour despite only being applied to the rim?

Yes — Red's intensity carries through clearly regardless of how much surface area it covers, making the outline treatment a particularly effective way to introduce this bold colour without the visual weight a full-face Red block would bring across a larger wall area.

Can Red be used sparingly within a mixed-colour installation to draw attention to specific points?

Yes — a single Red-outlined block, or a deliberate scattering of them within a larger multi-colour pattern, draws the eye more than calmer shades like Green would, making it a useful tool for guiding visual attention to specific points within a composition. As the newest addition to T21's Colour Outline range, Red completes the full six-shade set alongside Blue, Yellow, Orange, Green, and Purple, giving projects access to a genuinely comprehensive colour palette within this specific outline-treatment format for the first time. Confirm current stock and dispatch timing with T21 via WhatsApp when ordering this shade. As this is a newly added listing, a brief turnaround on the first few boxes is typical while initial stock is confirmed.