A few of their paints do contain MI / MCI, but many do not. See this statement on the Organic Natural Paint website for more information and a list of unsafe products, although note that this statement is now well over a year old, so double check before you buy. Their UK site is here. View the TDS (technical data sheet) for the individual products, and see ingredients listed under ‘Composition’. The isothiazolinone preservatives are listed as ‘thiazoles‘ so avoid any including this word. For example, the Auro 320 clearly includes them so is unsafe. The Auro 328 is safe, and has had some good anecdotal feedback.
Biofa (UK / Ireland)
All except one Biofa paint type are free of isothiazolinone preservatives (the unsafe one is called Primasol). One which is confirmed safe is the Biofa Solimin, which is a silicate-based mineral paint which UK stockists GreenSteps have told us has “several satisfied MI customers”. You can obtain it from GreenSteps Ltd directly, who told us the price is £7-10 per litre, depending on the colour used. In Ireland, the paints are available from Biochrome.
Edward Bulmer Paints (UK)
Their 72 colours are available in six finishes – three of which are MI-free. These three are water-based eggshell, oil-based eggshell and oil gloss. (You can choose one of these three options once you have chosen your colour.)
Edward Bulmer are currently (March 2017) selling off limited stocks of an MI-free emulsion to UK buyers. For details, click here.
Green Planet Paints (US)
We have been told that all paints are soy-based and free from the isothiazolinone group of preservatives. They use their own preparatory preservative. Click to their website here. To see ingredients, click the MSDS from the individual product pages. Paints contain ingredients such as clays, titanium, earth and marble.
Natural powder paints, hailing from Germany, and which use clays, marbles and mineral pigments. They are also free from petrochemical and synthetic ingredients.
Available as Unearthed Paints in the US (see below).
Lakeland Paints (UK)
Use several isothiazolinones in their paints, BUT they can do bespoke handmade paints without them, on special order, with one week’s notice. This is however very expensive – in the region of £150 per gallon – and shelf life is very short (just a few weeks). See their website for colour options.
Lime Earth Paints (UK / France)
Lime paints, lime mortars and plasters, which founder Stuart Furby has assured us are free from additives, including isothiazolinones. See their website for details. Mail order in the UK, around a dozen UK stockists, and one in France.
The Old Fashioned Milk Paint Company (US)
Powder paints based on milk, limestone, carbon, clay and earth pigments, to be mixed with water by consumer. Available via Amazon (US). Free sample offer available here.
Real Milk Paint (US)
Powder paints made with purified milk, lime, natural fillers and pigments. Kaolin clay-free. Last around two weeks once mixed with water. See their website for more details.
Unearthed Paints (US)
“Purely natural wall paints, plasters and wood finishes”. Water-free dry mixes which are preservative free, and contain only ingredients such as clays, mineral pigments, plant fibres and marble powder. See their website for more details.