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PP140 - Gram staining
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An updated method of staining gram-positive and gram-negative bacteria using basic equipment. 
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RB088 - Gram stain solutions
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Guidance on how to prepare the stains needed for gram staining - to distinguish between Gram-positive and Gram-negative bacteria.
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PP099 – Testing for positive ions: non-transition metals
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The positive ions aluminium (Al3+), potassium (K+), lead(II) (Pb2+) and ammonia (NH4+) can be tested for with simple test tube reactions. These tests are more specific than precipitation reactions wit.. more
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PP100 – Testing for positive ions: transition metals ions
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The metal ions cobalt(II), copper(II), iron(II) and iron(III) can be tested for with simple test tube reactions. These tests are more specific than precipitation reactions with sodium hydroxide soluti.. more
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RB101 - Test reagents for positive ions
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Guidance on how to prepare reagents used to test for the presence of cations. This Recipe only includes those reagents that are not covered by other Recipe Sheets.
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PP098 – Testing for positive ions: reactions with hydroxides and ammonia
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Testing for positive ions: reactions with hydroxides and ammonia. This microscale practical is carried out on a worksheet that is laminated or placed in a plastic wallet. The method minimises the use .. more
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PP011 - Testing for carbonyl compounds with Fehling's solution
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Although both aldehydes and ketones contain the carbonyl functional group (-C=O), only aldehydes give a positive test (formation of an orange to brick-red precipitate of copper(I) oxide) with Fehling’.. more
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GL140 - Using semolina and an EHT to show electric field lines
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Most A-Level Physics syllabi require students to sketch various combinations of electric field patterns (e.g. a positive point charge and negative point charge, or a positive point charge to a neg.. more
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PP012 - Testing for carbonyl compounds with Tollen's reagent
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Although both aldehydes and ketones contain the carbonyl functional group (-C=O), only aldehydes (or reducing sugars) give a positive ‘silver mirror’ test result with Tollen’s reagent. This small-scal.. more
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Bulletin 166 - Autumn 2019
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- A positive editorial- New arrangement for re-newing membership- Sterilising with pressure cookers- A 'world' without technicians- Updated method for the howling Jelly Baby- Making and disposing of n.. more
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