A figure-eight shaped curve whose equation in polar coordinates is ρ2=a2 cos 2θ
In algebraic geometry a lemniscate may refer to any of several figure eight shaped curves. The word comes from the Latin “lēmniscātus” meaning “decorated with ribbons.”
In lazure painting it is the ‘brushing out’ technique of the translucent glazes.
One day in around 1704, a Herr Diesbach was settling down to make carmine lake according to a tried and tested recipe – mixing ground up cochineal, alum and ferrous sulphate, then precipitating it all with an alkali – when he realised he had run out of alkali. He borrowed some from his boss, but did not realise it had been distilled with animal oil. Suddenly, to his amazement, he found blue instead of red in his flask. The clue is in the ‘animal’ element: the mixture had contained blood, which contains iron. Diesbach had unwittingly created iron ferrocyanide, which was dubbed ‘Prussian blue’ and was instantly popular, particularly as a house paint.
From Travels through the Paintbox by Victoria Finlay.
When natural light falls upon a lazure painted wall, there is a subtle fluctuation of colour. Here it is yellow ochre and English red.
“Frost of an alien place – warmth of self-discovery.”
The original concept and colour scheme for the medical centre was – reddish on the right hand side coming in from the front door and bluish on the left side. This was to reflect the active side of the doctors and the caring side of the nurses, with meeting in peach blossom in the middle and upper landing to reflect the mixing of red and blue in the blood, leading towards the truly human of the future.