in fig3 opening of the filter 13 exposes the filter screen 20 such that the lens particles material 21 which tends to cling to the screen 20 face can be scraped away for collection as illustrated in fig4 the filter screen 20 is exposed such that the entire face is accessible and no edges or corners limit the amount of collected material that may be scraped away a spatula 22 or other suitable tool may be provided to scrape the filter screen 20 this tool may also be shaped to enable manipulation of the lens material which retains the consistency of damp brown sugar into a secondary collection vessel 23 the secondary collection vessel 23 of the illustrated embodiment takes the form of a piece of jewellery or wearable memento the lens particles material 21 are loaded into the secondary container 23 in a manner that is hygienic and safe for the operator in the illustrated embodiment the spatula 22 is configured to be received by a small funnel 24 located partially in the open neck of the secondary collection vessel 23 such that no material is lost in the process fig5 and 6 illustrate preferred embodiments of the secondary collection vessel 23 in the form of jewellery pieces which as illustrated take the form of a vial 25 with a cap 26 which when capped can be worn or carried as a pendant in order to maintain the simplicity and safety of the system the jewellery pieces particularly the vials 25 can be housed or arranged such that handling or correct orientation of the small parts is not required a preferred configuration of equipment to achieve this is illustrated in fig7 in which the vial 25 is retained in an upright position.