We will also look at taping the bottles lids in future as this may prevent any tampering with the goods and also if the tape has been removed then the customer will know if the bottle has been previously opened / used etc..”
We have some starch that doesn’t dissolve properly. When weighing out the usual amount and making it up you get a wallpaper paste consistency. We use it in a junior science experiment Making Plastic from StarchOh - I also got some 'Soluble' starch which I couldn't get clear at all even with prolonged boiling- most of it was settled out. Previous batches from the same school supplier clarified with minimum heating. I have also noticed that some bottles now say 'super pure' which to my knowledge is not an accepted method of stating the purity. I fear that standards of chemical purity/quality from school suppliers have recently taken a dive!