The ratios are not terribly critical. You might want to give it a try. Use distilled water for all solutions for best results. Keep slimes away from anything they could damage. They can dry into fabric, and any dyes they may have can stain.
All slimes can potentially harm surfaces, especially wood.
Supervise small children when playing with slimes so they do not ingest any. Some people are allergic to Borax powder. Wearing rubber gloves when mixing should help. Slimes using Borax solutions work best if you pour the Borax solution into the other solution, rather than the other way around. Coloring should be added before the Borax.