You will need:-

12g Potassium Permanganate
6g Crushed paraformaldehyde

1) Set the hood so that it can vent outside.

2) Mix the two chemicals above together (in a jam/coffee jar, so it can be thrown away) in the hood, wear gloves and a face mask.

N.B.: Potassium permanganate is a strong oxidising agent while paraformaldehyde and formaldehyde vapour are extremely toxic.

3) Add 50ml water and mix.

4) Quickly place the front door of the hood in position, and tape over the joints.

5) Leave overnight and then switch on hood for at least 1 hour prior to use.

您知悉并同意，丁香通平台展示产品并非为平台自身产品，您发起询价或试用申请后，平台将会把您已提供或按要求提供的相关信息同步提供至所咨询的具体产品商家，由商家为您提供具体产品的价格咨询或产品试用注意事项及相关试用产品或完成相应购买，因此您知悉并授权平台将您的信息进行同步共享。您有权拒绝，但您知悉将无法参加询价或试用活动。