1. Use elbow grease and rub with a nylon scourer. Rinse with water. 2. Soak in white vinegar, maybe over a few days. Rinse well. You can probably use vinegar for the cover glass, but NOT for anything inside the tank. 3. Elbow grease again, using a one-sided razor blade. Rinse well.

1.To dry, for example, a whole rat skeleton, boil it down with some bleach in the water to get rid of all the remaining flesh, gristle, etc then dry it in the sun. 2.First scrape out the marrow then boil the bones for about 15 minutes in a solution of sodium bicarb. (a few tablespoons […]

To prevent cross-infection when using blindfolds, the following types are suggested: Cut up black plastic garbage bags into wide strips, long enough to go round a head and then tie up. Fold the strips in half. Ask students to place in the bin once used. Cover the safety glasses with alfoil. Use the cheap disposable […]

Try tonic water, Angostura Bitters and instant coffee, either in a fairly concentrated solution or straight onto the tongue in powder form. Diluted Angostura Bitters has the best success.

Junket tablets, found at supermarkets, are a terrific replacement for amylase. Start with sample solution of starch or food product, add iodine to show black colour then add a bit of crushed junket tablet and after awhile the solution will go from black to clear. You can then test the sample for sugar.