I believe 'heavy duty' foil is sold. I don't have any to check but my guess is both sides are shiny. In fact, I think I remember both sides being shiny the last time I used it...
It's 3.33x thicker, yes - we use it in foodservice. (0.8mm vs 0.24mm)
It's 3.33x thicker, yes - we use it in foodservice. (0.8mm vs 0.24mm)