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.
The same will happen if you engage the drill to its full speed. The trick here is to find a happy medium, that sweet spot at which the drill, the bit and the metal cooperate fully. TTP Hard Drill bits are the best cobalt drill bits for drilling stainless steel, chrome, hardened steel and harder alloys.