Our Colloids consist of very fine magnetite, approx. 10 nm, and water or oil. They have outstanding features at the same time, that is, high sensitivity and high stability, or no sedimentation and long life.

Water-based A-05D is used by applying a very small amount (e.g. with Q-tip) on a specimen, letting it dry. Then clear patterns of domain can be observed. The image on the right above is electrolytically polished silicon steel surface A-05D is applied. Water-based A-07 is used by dropping a droplet on a specimen and covering with a cover glass making sure it will not dry. Oil-based L-09 is used the same way as A-07. As it dries about 130 times slower than water, it suits for long-time or high-temperature observation. With A-07 and L-09, microscopic observation of domain wall movement is possible. The image on the right bottom is dark-field microscopic image of soft-magnetic thin film A-07 is dropped and covered by a glass. For all observations, specimens need to be polished to mirror surface.