#1 Science Forum For Lab Technicians

Morning Everyone, Just wondering am I able to store red cabbage indicator for a long period time in the fridge or does it go off after a while?

We have the grey/white plastic trays. I get the teachers to get the kids to do the dissections on news paper. The trays are there to hold the utensils needed

kimmy68 wrote: ↑02 Jun 2023, 12:09 To stop matches going down drain and many other things.
Get a sink drain strainer thing for Bunnings and just a couple of drops of hot glue to hold it in place.

Exactly what I did to every sink in Science. The GA and I got sick of fishing pens, pencils and other stuff out of them

Sometimes woolies or coles have kidneys...I get mine from our local wholesaler

I use an old blender

we have bought them from a pet store

No...I Just made this up for one of my teachers experiment.. I diluted a 0.5m down to make it.. basically its about 3 drops into 999.98ml of water as i was making a Litre...the correct dosage for diluting a 0.5m is 0.2ml, but if you are making it straight from 32% HCL it is 0.009ml..Hope this helps

Morning Everyone,
My HT is looking into doing the Antibiotic Sensitivity Testing and was wondering what bacteria is the safest to use and the matching Antibiotic. Also would like to know do they come in sets ready made. Thanks

Hi Kimmy
I usually use this website if i get stuck and have found it good. Hope it helps

https://www.sigmaaldrich.com/chemistry/ ... lator.html

mtg wrote: ↑21 Jul 2020, 11:32 Good to know. What strength Phenolphthalein did you use and how much? I find it's so hard to get the right colour so it doesn't fade. usually make it too pink.

I usually use the crystals and it works well

Kathryn wrote: ↑30 Jun 2020, 15:03 Where do you source your bottles from? I am finding the dropper bottles seem to now be a wider bottle which does not fit in the unitrays.
Kathryn

Hi Kathryn
I get my bottles from Southern Biological

Hi everyone, Just a question for those who are using the STUHL plastic dropper bottles. Do you keep all chemicals in these or do you keep your iodine's,universal indicators and stains in amber dropper bottles?
TIA

I don't know if there is any shelf life for luminol, especially in a school setting. Might be different if you're trying to track down an offender who is on the run! Once made up, it has a very short shelf life of only about two hours. I have a good recipe for detecting blood if you need it. Hi Mer...

Mine is Lab Technician, but I like to say that i'm the boss of the teachers, they sometimes agree

We bought our bluetooth ones from Ciderhouse. Teachers and students are happy with them

I noticed a colour change

I get mine from a wholesale butcher here in the Illawarra and they cost me $1 each

Hi would a large glass baking tray work??

ELIZABETH wrote: ↑03 Feb 2020, 10:44 I've bought from AMF and the magnets are great.....and their customer service is excellent!
Liz

Hi Liz, are these the ones you got https://magnet.com.au/alnico-block-magn ... x-5mm.html
thanks

I've found the IEC ones are quite good. I've ordered more of these and am waiting on them. Also, one of my teachers wanted a certain type of magnet and found a company, AMF Magnetics that have a huge range, although don't know the quality but suspect they may be better than some of the cheaper &quo...