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.
For drilling holes in plates, fused glass and dense, hard sea glass we recommend using a small diamond core drill. These are available in sizes from as small as 1mm. DO NOT use diamond drill bits on metal or soft wood. These materials are too soft and will cause the diamonds on your drill bit to clog up. When drilling holes in soft metals and wood use High Speed Steel drill bits (HSS) and for drilling holes in hard metals use Carbide Drill Bits.