Goldfish Development. Baby goldfish are born much darker than they will be as adults. This may be because dark colors helps these small, vulnerable fish escape the attention of predators. With proper husbandry, the fish gradually change color and develop orange or gold scales. Fancy goldfish may develop color patterns including white patches.
Posts: 1,396. Re: Bits for hand drilling hardened steel. If you want to experiment with carbide drilling on the cheap, buy a carbide tipped masonry drill bit set. They are about $20 a set new, but I find them at garage sales for about $1 for the set all the time and that's why I use them.
However, standard drill bits are generally designed for wood, metal, or masonry, and one can familiarize oneself with different bit types before buying drill bits from a hardware store or an online source like eBay. Additionally, bits designed for metal can usually be used on softer materials like wood or plastic.