'The Little Red Book of the National Gallery' available through their online shop. Great response so far. Here's a snip from their online store.
"New and exclusive: The Little Red Book of the National Gallery. An indispensible pocket guide full of facts not only on National Gallery paintings but almost anything art-related.
Discover which early colours contained arsenic and mercury, the meaning of apples in religious and mythological paintings, and fascinating details on some of the Gallery's rather quirky sculptures…"