I've been watching Nigel on his KZfaq channel for about a year now, he's taught me a lot, one of the best teachers on KZfaq in my opinion.

Thanks for the wealth of information, I have ordered Nigels book..👍👍 Best regards!

Por favor el libro esta traducido al español ?? Me interesa y también los cursos .pon subtítulos en español .Gracias

In your book you say stir the solution for a "period of time" clockwise and then the same time counterclockwise...can you be more precise? One minute, five, ten? Or how many revolutions?