In such a fine powdered form, iron can burn, due to its increased surface area. The primary utility of iron filings is in the study and teaching of magnetism and electromagnetic fields. The substance makes impressive demonstrations when sprinkled on a white card placed on top of a permanent magnet, such as a bar magnet.
Here are a few of the specific jobs that are unsafe for pregnant women: 1  Farming. 2  Dry Cleaners. 3  Factory work where there is chemical exposure, too much heavy lifting, or a risk for falls. 4  Print Shops. 5  Craft shops that expose you to drying chemicals, paints, etc.6  Highway worker. 7  Toll Booth operators.8  Construction.obs that are unsafe for pregnant women include: 1  Any job where you are working with hazardous chemicals such as pesticides, toxic cleaning solutions, lead, second hand smoke, etc. 2  Any position where you are doing heavy lifting.
Pennyroyal is considered likely unsafe to use during pregnancy. There is some evidence that pennyroyal in high doses can cause abortion. It can also cause kidney and liver damage to the mother and be fatal. Do not use this product without medical advice if you are pregnant.