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.
But these drill bits are used for a very special purpose. Cutting through or drilling holes into stainless steel is not something most people need to do with their household drill. So, in part, using titanium or cobalt bits depends on what type of task and how often you plan to use the drill bits. Check out the different cobalt drill bits and titanium drill bits on our site.