In magnetite, Fe3O4, iron exists in two different oxidation states. The compound can be viewed as FeO · Fe2O3, where FeO represents iron (II) oxide with iron in the +2 oxidation state, and Fe2O3 represents iron (III) oxide, with iron in the +3 oxidation state. Therefore, in magnetite, two-thirds of the iron atoms have a +3 oxidation number, and one-third have a +2 oxidation number. This mixed valence is what gives magnetite its unique properties. The overall formula can also be written as Fe(II)Fe(III)2O4 to reflect the oxidation states directly. This mixed-valence nature is a key aspect of its magnetic properties and is fundamental to understanding the behavior of magnetite in various chemical and physical contexts.

Blocking handspun yarn is essential to relax the fibers and enhance the stitch definition, resulting in a finished project that looks professional and is more pleasant to the touch. First, soak the yarn or finished knitting/crochet item in lukewarm water with a bit of gentle soap for about 20-30 minutes. This allows the fibers to absorb water and become pliable. After soaking, carefully remove the item without twisting or wringing to avoid felting, especially if it's wool. Roll the item in a towel and press gently to remove excess water. Next, lay the item flat on a blocking mat, shaping it to the desired measurements and dimensions. Use rust-proof pins to hold edges in place if necessary, especially for lace or items that require stretching to showcase their pattern. Allow the item to air dry completely. Blocking wire can be useful for straight edges or large pieces. Remember, the method can slightly differ depending on the fiber composition of your handspun yarn, so adjust accordingly.

Breathing in resin fumes can indeed be harmful, posing several health risks, especially with prolonged exposure. Resin, in its uncured state, releases volatile organic compounds (VOCs) and other potentially harmful chemicals. Inhalation of these fumes can lead to respiratory irritation, allergic reactions, and in severe cases, chronic respiratory issues or sensitization. The level of harm generally depends on the type of resin (e.g., epoxy, polyester, or polyurethane), duration of exposure, and individual sensitivity. It is crucial to work in a well-ventilated area, use protective equipment like masks designed to filter out organic vapors, and adhere to safety guidelines provided by the resin manufacturer. Those with pre-existing respiratory conditions should be particularly cautious and consult with professionals before handling resin.