Working with squid, and even utilizing the ink, will stain not just your clothes, but also your hands, certain cutting boards, and other surfaces. Depending on the color of the clothing, you can use Clorox or Oxiclean to remove the majority of the stain. For colors such as red or purple that are more difficult to remove, try soaking the item in a mixture of 1 part acid to 9 parts water. Let it soak for at least 30 minutes and then wash as usual. In conclusion, squid ink is a dark blue pigment made from cuttlefish bones and is used as a colorant in food products and some personal care items. It may be used as a substitute for black pepper or salt because of its similar color. However, it should not be ingested because it contains toxins that can cause vomiting, diarrhea, and abdominal pain. Additionally, working with squid ink will stain materials such as clothes, dishes, furniture, etc. Regular household cleaners can remove most stains caused by squid ink except for darker colors which require a mixture of water and vinegar or lemon juice.