Here's another alternative to liver etc if you want to do an enzyme prac.
We haven't done this version for years, but one of our teachers resurrected it & it's worked nicely with our IBs this week. I think the original prac idea came from Southern Biological & we just reworked it a bit. You can also find different versions online if you google it.
It uses apple & pectinase, but you can adapt it to use other fruits if you want to compare them. We've just done apple vs tomato. Any tinned fruit will do as long as there's no added sugar, & you can get pectinase powder from any beer brewing shop.
When we first did it years ago the kids broke heaps of 50ml measuring cylinders, so it's best to go with plastic beakers & cylinders if you've got some.
Pectinase Prac Method.docx
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We did have success with this one though. I blended about 6 green capsicum with 100ml distilled water- made about 500ml capsicum juice, and used freshly made 10% hydrogen peroxide. Repeated with the yellow. It worked a treat and my teachers were very happy 
Why didn't you tell me about the tongue thing earlier. It dammed well worked - and gave wonderful results - but only if I stuck my tongue out just ever so slightly to the left. We have put it down to our qld capsicums - bought the last lot on special - we recon that the yellow ones were just green ones painted yellow. Get what you pay for.
So I found out what the difference is, green capsicum ripens to red, whereas yellow capsicums are a hybrid of green capsicums and ripen to orange... So there we go, cleared that one up for us!
